不同处理芝麻粕用作鸡饲料的营养价值评定

通过营养成分测定和鸡代谢试验来评定不同处理芝麻粕营养价值.结果显示:与普通芝麻粕相比,发酵芝麻粕的组氨酸、蛋氨酸和磷表观代谢率显著高于普通芝麻粕(P＜0.05),组氨酸和蛋氨酸真代谢率极显著高于普通芝麻粕(P＜0.01).酶解芝麻粕的磷表观代谢率显著高于普通芝麻粕(P＜0.05),蛋氨酸表现代谢率和真代谢率极显著高于普通芝麻粕(P＜0.01),苏氨酸真代谢率极显著低于普通芝麻粕(P＜0.01).     

大米蛋白肽和制粒对肉杂鸡杂粕型日粮主要养分利用率的影响

研究大米蛋白肽和制粒对杂粕型日粮养分利用率及能量代谢的影响。选择8周龄的健康肉杂公鸡63只,随机分为7组,每组3个重复。一组是内源组,其余6组分别饲喂豆粕型粉料日粮(对照组)、杂粕型粉料日粮(试验1组)、杂粕+1.4%大米蛋白肽粉料日粮(试验2组)、杂粕+1.8%大米蛋白肽粉料日粮(试验3组)、杂粕+1.8%大米蛋白肽颗粒料日粮(试验4组)、杂粕+2.2%大米蛋白肽粉料日粮(试验5组)。强饲后禁食,每12 h收集一次排泄物,共收集3次,测定有机物、Ca、P、粗蛋白、氨基酸的表观和真利用率、表观代谢能和真代谢能。结果表明:杂粕日粮添加大米蛋白肽,能显著提高蛋白质的表观和真利用率(P0.05),添加1.4%的大米蛋白肽能显著提高总氨基酸的表观和真利用率(P0.05),并提高蛋氨酸、亮氨酸、赖氨酸、酪氨酸、天冬氨酸、谷氨酸和精氨酸的表观和真利用率,添加1.8%和2.2%的大米蛋白肽能极显著提高总氨基酸、蛋氨酸的表观和真利用率(P0.01),还明显提高异亮氨酸、苏氨酸和缬氨酸的表观和真利用率(P0.05);杂粕日粮添加大米蛋白肽并制粒后,进一步提高钙、磷、有机物、胱氨酸、苯丙氨酸的表观和真利用率及表观代谢能和真代谢能(P0.05)。显示在肉杂鸡杂粕日粮中添加1.8%~2.4%的大米蛋白肽并制粒,能显著提高饲料中主要养分的利用率、表观代谢能和真代谢能。     

发酵饲料对断奶仔猪生产性能、血液生化指标和饲料养分表观消化率的影响

选用28日龄断奶的三元杂交(杜×长×大)仔猪60头,随机分为饲喂发酵饲料的试验组和不合发酵料的对照组:每个处理3个重复,每个重复10头猪.试验结束前连续收集3天粪便,测定饲料养分的表观消化率;试验结束时前腔静脉采血,测定血清生化指标.结果:试验组比对照组显著降低了料肉比和腹泻指数(P＜0.05),日增重提高,但显著不差异(P＞0.05);血清碱性磷酸酶显著提高(P＜0.05),而血清尿素氮、总蛋白、白蛋白、谷丙转氨酶均没有显著变化(P＞0.05).饲料养分的表观消化率(CTTAD)试验组日粮磷的消化率显著提高(P＜0.05),粗脂肪消化率显著下降(P＜0.05),粗蛋白和钙的消化率提高,但无显著差异(P＞0.05).结果表明,发酵饲料有利于提高仔猪的生长性能和饲料养分的表观消化率,对降低仔猪断奶应激性腹泻有较好效果.     

杂粮淀粉在仔猪体内的消化率研究

以60 日龄生长猪为动物模型,考察4 种不同杂粮原料中淀粉(总淀粉、直链和支链淀粉、抗性和非抗性淀粉)的含量及其在生长猪回肠末端和粪中的表观消化率。结果表明：以干物质为基础,各种杂粮淀粉的含量因杂粮种属不同而差异较大。芋头淀粉和木薯淀粉的回肠末端消化率均显著高于(P ＜ 0.05)土豆和山药淀粉;所有淀粉在粪便中的表观消化率均达99% 以上。芋头淀粉和木薯淀粉因回肠末端消化率高而具有较高的葡萄糖供给效率,土豆淀粉和山药淀粉因后肠微生物的发酵而利用率升高。     

主要粮食饲料资源氨基酸消化利用率的研究

采用8头初始体重为(27．2±2．3)kg、在回肠末端装有简单T型瘘管的杜长大三元杂交公猪, 手术康复后随机分成2组,每组4头,每组采用同一豆粕-玉米淀粉基础日粮,按拉丁方设计,用于测定豆粕、棉粕、菜粕、稻谷、油糠、统糠和玉米7种饲料原料的回肠和粪氨基酸消化率。结果表明:所测氨基酸平均表观消化率回肠比粪低5—8个百分点(P<0．05);稻谷氨基酸表观消化率比玉米低5％;所测原料氨基酸表观消化率与中国饲料数据库等报道结果基本吻合。     

不同处理复合油菜籽对蛋鸡的营养价值评定

通过动物实验测定不同处理的复合油菜籽代谢能和营养物质的消化利用率,评定其对蛋鸡的营养价值。实验材料为破碎复合油菜籽、熟化复合油菜籽和膨化复合油菜籽。1)真代谢能法(TME)测定油菜籽代谢能与营养物质利用率:将64只30周龄、体重(3. 00±0.03) kg的海兰褐种公鸡,随机分为4组,分别强饲破碎复合油菜籽、熟化复合油菜籽、膨化复合油菜籽或绝食。2)氨基酸回肠消化率的测定:将48只25周龄、体重(2. 50±0. 02) kg的海兰褐蛋鸡,随机分成3组,分别饲喂纯合无氮饲粮、破碎复合油菜籽半纯合饲粮、膨化复合油菜籽半纯合饲粮。实验结果表明:1) TME法测定结果:熟化复合油菜籽和膨化复合油菜籽的TME值分别为14. 41、14. 59 MJ/kg;与破碎复合油菜籽相比,膨化复合油菜籽的粗脂肪和粗蛋白质表观利用率分别提高21. 79%和25. 22%(P 0. 01);除甘氨酸、组氨酸外,膨化复合油菜籽的氨基酸全肠道表观利用率和真利用率高于破碎复合油菜籽(P 0. 01)和熟化复合油菜籽(P 0. 05);熟化复合油菜籽大部分氨基酸全肠道利用率高于破碎复合油菜籽(P 0. 05)。2)氨基酸回肠消化率:与破碎复合油菜籽相比,膨化油菜籽的各氨基酸回肠表观消化率和回肠标准消化率得到了极显著的提高(P 0. 01),除了组氨酸外,膨化复合油菜籽各氨基酸回肠表观消化率、氨基酸回肠标准消化率都大于83%。复合油菜籽经加热处理尤其是135℃膨化后表观代谢能、粗脂肪、粗蛋白质、氨基酸利用率得到大幅度提高。     

黑曲霉PES固体发酵对棉籽粕营养价值的影响

本文探讨了棉籽粕固体发酵条件，评定了发酵棉籽粕的营养价值。结果表明，发酵条件为水添加量70％，种子量10％，自然pH，30℃恒温培养48h；发酵后棉籽粕的粗蛋白提高了10.92%，必需氨基酸除精氨酸外均增加，尤其是赖氨酸、蛋氨酸和苏氨酸，它们分别提高了12.73%、22.39%和52.00%；发酵后棉籽粕的干物质、蛋白质和氨基酸等养分体外消化率也明显提高，其中粗蛋白、赖氨酸、蛋氨酸和苏氨酸的体外消化率分别提高了13.11%、15.17%、27.07%和12.90%。     

生长猪对菜籽饼中氨基酸表观消化率的研究（上）

选择健康、体重约45公斤长白×成华阉公猪4头,安装“T”型回肠痿管。以 Cr_2O_3作指示剂,用直接法测定了生长猪对浓缩菜籽蛋白、脱毒菜籽饼的氨基酸表观消化率;用套算法测定了200型机榨浸提菜籽饼(甘兰型)的氨基酸表观消化率;并进行了比较。结果表明:1)用粪分析法测得的氨基酸表观消化率高于回肠法的结果;用粪指示剂法测得的结果与全粪法的接近。2)用粪分析法测得的浓缩菜籽蛋白的氨基酸表观消化率,比脱毒菜籽饼的高,但多数差异不显著(P>0.05);而用回肠法测得的结果,则浓缩菜籽蛋白比脱毒菜籽饼的低,且多数达显著(P<0.05)或极显著水准(P<0.01)。但赖氨酸、蛋氨酸差异不显著。故从应用角度看,可认为两种菜籽饼的氨基酸表观消化率接近。3)200型机榨浸提菜籽饼必需氨基酸中,赖氨酸表观消化率最低(回肠法、全粪法、粪指示剂法测得的结果分别为48.84%、68.41%和63.25%)。     

外源消化酶对羔羊营养物质消化率及生产性能的影响

研究了外源消化酶对羔羊采食量、生长性能、消化性能以及羔羊营养物质表观消化率的影响.试验分4个组,试验1组饲喂基础饲粮为对照组,其他3组饲喂基础饲粮基础上添加不同外源消化酶组合,研究不同外源消化酶组合对羔羊日采食量、日增重和营养物质表观消化率的影响.结果表明:羔羊日均采食量2组和4组与1组差异显著(P＜0.05),其余之间差异不显著(P＞0.05);3周的平均日增重2组、3组、4均与1组差异显著(P＜0.05),但2组与4组间差异不显著(P＞0.05);干物质、能量、脂肪和无氮浸出物的表观消化率试验组均高于对照组(P＞0.05),但能量的表现消化率2组和4组均显著高于1组和3组(P＜0.05);粗蛋白的表现消化率试验组均显著高于对照组(P＜0.05),试验4组酶制剂组合效果最好.     

生长猪对植物性蛋白饲料中氨基酸表观和真利用率的研究

用4头安装有简单T型回肠瘘管的生长肥育猪,测定豆饼、花生饼、葵花饼和菜籽饼在猪的全消化道和回肠末端的表观和真氨基酸利用率。测试饼粕以玉米淀粉为基础,配合成14％的粗蛋白水平。体内的代谢氨基酸和代谢N是采用饲喂合成的无N日粮进行测定。在回肠末端测定的表观和真氨基酸利用率,花生饼与葵花饼基本相似,两者显著高于豆饼,后者又显著高于菜籽饼,但在全消化道的测定值,豆饼与花生饼、葵花饼之间没有显著差异。对于必需氨基酸,豆饼中的氨基酸、缬氨酸利用率最低,赖氨酸较高;花生饼和葵花饼中的赖氨酸值最低,蛋氨酸值较高;菜籽饼中的蛋氨酸和赖氨酸值最低。豆饼、花生饼、葵花饼和菜籽饼中的赖氨酸、蛋氨酸和苏氨酸的回肠末端真利用率分别为37.0、85.4、83.6和64.2％;81.9、95.1、95.7和40.7％;83.8、90.7、69.9和75.5％。利用率最高的必需氨基酸是精氨酸。豆饼和菜籽饼中氨基酸的粪分析值显著高于回肠分析值,其中赖氨酸、蛋氨酸和苏氨酸分别相差4.7、9.5％:8.2、7.6％和3.1、12.8％。葵花饼中除赖氨酸以外的必需氨基酸、粪分析与回肠分析值没有显著差异。花生饼的粪分析值一般说来比回肠分析值低,其中赖氨酸、苏氨酸和蛋氨酸分别相差2.3、5.1和11.6％。粪分析的蛋白质消化率与平均氨基酸利用率相近,但回肠分析的蛋白质消化率显著低于氨基酸利用率的平均值。除菜籽饼外,回肠分析的赖氨酸真利用率与蛋白质真消化率值是相近的。     

Digestible energy values of diets with different fat supplements when fed to lactating dairy cows

A total collection digestion trial using high producing lactating cows (average milk yield = 40.7 kg/d) was conducted to measure the effect of different fat supplements on dietary digestible energy (DE) concentrations and to calculate the DE value of the supplements. A diet with no supplemental fat, 2 diets with 1.75 or 3.5% (dry basis) Ca salts of palm fatty acids (Ca-PFA), and 2 diets with 1.6 or 3.2% hydrogenated triacylglycerides from palm oil (HPO) were fed in a 5 x 5 Latin square experiment with 28-d periods. Concentrations of supplemental long-chain fatty acids in the diets were 1.7 and 3.4% for the 2 supplementation rates. Dry matter intake was reduced when cows were fed the high concentration of Ca-PFA, but cows fed Ca-PFA produced more milk than cows fed the control diet or diets with HPO. The type or amount of fat supplementation did not affect measures of rumen fermentation or in situ fiber digestibility. Digestibility of energy, dry matter, and organic matter were higher for diets with Ca-PFA than for diets with HPO, mainly because of increased fatty acid digestibility. The dietary concentration of DE was similar between the control diet and diets with HPO (2.97 Mcal/kg), but it increased as the concentration of Ca-PFA increased (3.04 and 3.16 Mcal/kg for low and high supplementation rates). The calculated DE concentrations of the supplements averaged 7.3 and 3.1 Mcal/kg for Ca-PFA and HPO. The 2001 National Research Council dairy model accurately estimated DE concentrations in all diets (<1% difference).     

Symposium review: Re-evaluation of National Research Council energy estimates in calf starters

Provision of nutrients in appropriate amounts to meet nutrient requirements for growth, production, and reproduction is the basis for modern animal nutrition. Ration formulation systems predict nutrient requirements based on numerous inputs and then predict nutrient supply based on predicted intake and nutrient content of feeds. Energy systems are used to predict energy supply based on gross caloric content of feeds followed by adjustments for digestion and metabolism of ingested energy. Many models of energy supply use static coefficients of digestibility based on nutrient composition of feed. Other models partition digestion dynamically between ruminal and postruminal digestion but use static estimates of intestinal digestibility to predict energy supplied to the animal. In young calves, both ruminal fermentation and intestinal digestion are underdeveloped; therefore, existing models of energy supply might overestimate the energy available before complete gastrointestinal maturation. In a series of experiments, we reported that total-tract digestion of nutrients changes with advancing age and nutrient intake. Total-tract digestion was measured in calves from 3 to 16 wk of age when fed different amounts and types of milk replacers. Calves were also fed different types of calf starter for ad libitum consumption. Total-tract digestibility of protein, fat, neutral detergent fiber, and nonfiber carbohydrate (NFC) was used to calculate the metabolizable energy (ME) in starter. We used nonlinear regression to estimate the contribution of protein and fat from starter and milk replacer before weaning. Early in life, calculated ME of starter was low and increased with increasing intake of NFC. Cumulative intake of NFC was more highly correlated with changing ME values than other indices, including age, intake of milk replacer, or intake of other nutrients in starter. When calves consumed at least of 15 kg of NFC, ME calculated from digestibility measurements was similar to the ME calculated using National Research Council equations and indicated maturation of gastrointestinal digestion. Our data suggest that intake of NFC is critical to gastrointestinal maturation and the calf's ability to extract energy from calf starter.     

Influence of repeated frying on the digestive utilisation of various fats

Three types of fat, olive oil, soya bean oil and a solid cooking fat were used to fry potatoes, lean beef or sardines. The heating cycle was carried out once and repeated ten times and the true digestibility (TD) and energy digestibility (ED) determined by feeding trials on rats. The results showed very little change in either measurement compared with the fresh, unheated fats. Discarded olive oil from an industrial fryer was also examined and found to be only slightly lower in TD and ED than after ten cycles in the laboratory.     

Dietary fatty acid and starch content and supplemental lysine supply affect energy and nitrogen utilization in lactating Jersey cows

The effects of dietary fatty acid (FA) and starch content as well as supplemental digestible Lys (sdLys) on production, energy utilization, and N utilization were evaluated. Each factor was fed at 5 different amounts, and factor limits were as follows: 3.0 to 6.2% of dry matter (DM) for FA; 20.2 to 31.3% of DM for starch, and 0 to 17.8 g/d of sdLys. Dietary FA and starch were increased by replacing soyhulls with supplemental fat and corn grain, respectively, and sdLys increased with rumen-protected Lys. Fifteen unique treatments were fed to 25 Jersey cows (mean ± SD; 80 ± 14 d in milk) across 3 blocks in a partially balanced incomplete block design. Each block consisted of 4 periods of 28 d, where the final 4 d were used to determine milk production and composition, feed intake, energy utilization (via total collection and headbox-style indirect calorimetry), and N utilization (via total collection). Response surface models were used to evaluate treatment responses. Increasing dietary FA decreased DM intake and milk protein yield. When dietary starch was less than 24%, milk protein concentration increased with increasing sdLys, but when dietary starch was greater than 26% milk protein concentration decreased with increasing sdLys. Digestibility of FA increased when dietary FA increased from 3.0 to 4.2% and decreased as FA increased beyond 4.2%. Although neutral detergent fiber digestibility decreased as dietary starch increased, energy digestibility increased. As dietary FA increased, metabolizable energy (ME) content quadratically increased. Supply of ME increased as dietary FA increased from 3.0 to 4.2% and decreased as FA increased beyond 4.2%. Increasing dietary FA and starch decreased CH₄ production and urinary energy. Increasing dietary starch increased the efficiency of utilizing dietary N for milk N. Increasing sdLys quadratically decreased N balance as sdLys increased from 0 to 8 g/d and increased N balance as sdLys increased from 8 to 18 g/d. Increasing dietary FA can increase ME content, however, at high dietary FA, decreased DM intake and FA digestibility resulted in a plateau in ME content and a decrease in ME supply. Our results demonstrate that sdLys supply is important for milk protein when dietary starch is low, and some Lys may be preferentially used for muscle protein synthesis at the expense of milk protein when sdLys is high.     

Influence of nutrition level on digestibility in high yielding cows and effects on energy evaluation systems

The objective of the study was to determine the effect of nutrition level (NL, multiples of maintenance energy requirement) on the digestibility of nutrients for dairy cows regarding the energy supply of the animal. The digestion of nutrients and energy was investigated in two trials using lactating dairy cows. The NL varied from 2.7 to 5.0 using diets similar composition. In addition, sheep were given the same feed with a NL of 1.4. Digestibility of dry matter (DM) and all specific measures of dietary components declined significantly as NL increased. Digestibility of energy decreased by 4.1% for each increase in NL. The metabolizable energy, the ability to metabolize energy (metabolizable energy/gross energy), and the content of net energy for lactation (NE(L)) per kilogram of DM intake were calculated for NL from 1 to 6 on the basis of these relationships and as well as the gross energy, methane energy, and urine energy. Accordingly the NEL content declined by 0.11 MJ/kg of DM intake or 1.6% as the NL increased by one unit. It means that the NE(L) requirement above the maintenance requirement increased by 0.07 MJ of NE(L) per kilogram of fat-corrected milk, if the NL increased by one unit.     

Modifications to the neutral detergent cellulase digestibility method for the prediction of the metabolisable energy of compound feedstuffs containing palm kernel meal

Abstract : Practical use of the prediction equation for metabolisable energy (ME) of ruminant feeds, which resulted from a study commissioned by the UK Agriculture Industry in 1986 (MAFF 1990), has produced low predictions for feeding stuffs containing palm kernel meal. This was found to be due to the presence of galactomannans which are not readily hydrolysed by the enzymes in the cellulase preparation used in the second stage of the neutral-detergent cellulase digestibility method. An additional commercially available enzyme, Gamanase, was identified as capable of hydrolysing these compounds. Whilst Gamanase was active at the same temperature and pH range as cellulase it was found necessary to extend the incubation period from 24h to 40h to achieve adequate agreement with in-vivo digestibility. Experiments showed that the modifications to the method had no significant effect on the predicted ME for feeding-stuffs not containing palm kernel meal.     

Nutritional effect of chlorogenic acid fed to growing broiler chicks

Experimental purified diets with supplemental chlorogenic acid (0, 2, 4 and 6 g kg⁻¹) were given to 25-day-old chicks for a period of 3 days; these levels of chlorogenic acid were approximately similar to those of diets containing 0, 100, 200 and 300 g kg⁻¹ ground sunflower seed. The excreta were collected quantitatively, and at the end of the experimental period the chicks were killed and the ileal digesta collected. No significant differences in food intake, crude protein, crude fat and starch digestibilities were found among chick groups. The presence of chlorogenic acid in the diet significantly affected neither the metabolisable energy value nor the individual ileal amino acid digestibility. These results indicate that dietary chlorogenic acid at a lower concentration than 6 g kg⁻¹ did not measurably affect the nutritional quality of diet. © 1998 SCI.     

The value of different fat supplements as sources of digestible energy for lactating dairy cows

The effects of fat supplements that differed in fatty acid composition (chain length and degree of saturation) and chemical form (free fatty acids, Ca salts of fatty acids, and triacylglyceride) on digestible energy (DE) concentration of the diet and DE intake by lactating cows were measured. Holstein cows were fed a control diet [2.9% of dry matter (DM) as long-chain fatty acids] or 1 of 3 diets with 3% added fatty acids (that mainly replaced starch). The 3 fat supplements were (1) mostly saturated (C18:0) free fatty acids (SFA), (2) Ca-salts of fatty acids (CaFA), and (3) triacylglyceride high in C16:0 fatty acids (TAG). Cows fed CaFA (22.8 kg/d) consumed less DM than cows fed the control (23.6 kg/d) and TAG (23.8 kg/d) diets but similar to cows fed SFA (23.2 kg/d). Cows fed fat produced more fat-corrected milk than cows fed the control diet (38.2 vs. 41.1 kg/d), mostly because of increased milk fat percentage. No differences in yields of milk or milk components were observed among the fat-supplemented diets. Digestibility of DM, energy, carbohydrate fractions, and protein did not differ between diets. Digestibility of long-chain fatty acids was greatest for the CaFA diet (76.3%), intermediate for the control and SFA diets (70.3%), and least for the TAG diet (63.3%). Fat-supplemented diets had more DE (2.93 Mcal/kg) than the control diet (2.83 Mcal/kg), and DE intake by cows fed supplemented diets was 1.6 Mcal/d greater than by cows fed the control, but no differences were observed among the supplements. Because the inclusion rate of supplemental fats is typically low, large differences in fatty acid digestibility may not translate into altered DE intake because of small differences in DM intake or digestibility of other nutrients.     

Mucilage in linseed: effects on the intestinal viscosity and nutrient digestion in broiler chicks

A study was conducted to obtain more information on the role of mucilage in the adverse effects produced by the use of linseed in chick diets. Mucilaginous material was extracted from linseed with hot distilled water (80 °C) for 2 h; after filtration the water‐soluble extract was freeze‐dried and ground. A maize/soyabean meal basal diet with supplemental linseed mucilage extract (0, 4, 8, 12 and 16 g kg^?1) was given to chicks from 8 to 28 days of age. During the last 3 days the excreta were collected quantitatively, then the chicks were slaughtered and the jejunal and ileal contents were collected. Feeding the mucilage extract‐containing diets to birds increased markedly, from 4.35 to 18.89 mPa s, the digesta viscosity at jejunal level. The apparent faecal digestibility of crude fat and major fatty acids and the dietary AMEn value (metabolisable energy corrected to zero nitrogen retention by the body) were linear and negatively influenced by the inclusion level of mucilage extract. However, the presence of mucilage in the diet did not affect the apparent ileal digestibility of crude protein and individual amino acids. These results seem to suggest that mucilage in linseed has lower antinutritional properties than those reported for whole linseed or linseed meal when included in chick diets. © 2002 Society of Chemical Industry     

Altering the ratio of dietary palmitic and oleic acids affects nutrient digestibility,metabolism, and energy balance during the immediate postpartum in dairy cows

This article is the second from an experiment that determined the effects of altering the dietary ratio of palmitic (C16:0) and oleic (cis-9 C18:1) acids on digestibility, production, and metabolic responses of dairy cows during the immediate postpartum. This article elaborates on the effect of these diets on nutrient digestibility, energy balance, and metabolism. Fifty-six multiparous cows were used in a randomized complete block design and randomly assigned to 1 of 4 treatments fed from 1 to 24 d in milk. The treatments were: (1) control (CON) diet not supplemented with fatty acids (FA); (2) diet supplemented with a FA blend containing 80% C16:0 and 10% cis-9 C18:1 (80:10); (3) diet supplemented with a FA blend containing 70% C16:0 and 20% cis-9 C18:1 (70:20); and (4) diet supplemented with a FA blend containing 60% C16:0 and 30% cis-9 C18:1 (60:30). The FA supplement blends were added at 1.5% of diet dry matter by replacing soyhulls in the CON diet. Three preplanned contrasts were used to compare treatment differences: (1) CON versus FA-supplemented diets, (80:10 + 70:20 + 60:30)/3; (2) the linear effect of cis-9 C18:1 inclusion in diets; and (3) the quadratic effect of cis-9 C18:1 inclusion in diets. The FA-supplemented diets increased digestibility of dry matter, neutral detergent fiber, 18-carbon FA, and total FA compared with CON. We observed a tendency for an interaction between treatment and time for the digestibility of 18-carbon and total FA because the difference in digestibility between CON and 60:30 treatments tended to increase over time. Increasing dietary cis-9 C18:1 increased linearly the digestibility of dry matter, neutral detergent fiber, 16-carbon, 18-carbon, and total FA. Interestingly, total absorbed FA was positively related to milk, milk fat yield, energy-corrected milk, plasma insulin, and albumin, and negatively related to plasma nonesterified FA (NEFA) and body weight loss. The FA-supplemented diets increased intake of digestible energy, metabolizable energy, and net energy for lactation compared with CON. Compared with CON, FA-supplemented diets increased milk energy output and tended to increase negative energy balance. Increasing dietary cis-9 C18:1 increased intake of digestible energy, metabolizable energy, and net energy for lactation. Although increasing dietary cis-9 C18:1 did not affect milk energy output and energy for maintenance, increasing dietary cis-9 C18:1 improved energy balance. Compared with CON, FA-supplemented diets increased plasma insulin, but we did not observe differences between CON and FA-supplemented diets for NEFA and albumin. Increasing cis-9 C18:1 in FA treatments linearly decreased plasma NEFA and tended to linearly increase insulin and β-hydroxybutyrate. During the carryover period, no treatment differences in blood metabolites were observed. Our results indicate that feeding FA supplements containing C16:0 and cis-9 C18:1 during the immediate postpartum period increased nutrient digestibility, energy intake, and milk energy output compared with a non-fat-supplemented control diet. Increasing dietary cis-9 C18:1 increased energy intake, reduced markers of body fat mobilization, and improved energy balance during the immediate postpartum.