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1.
本试验旨在建立肉用绵羊饲粮营养物质消化率和代谢能(ME)的预测模型。选用66只体重为(45.0±2.0)kg的体况良好的杜泊×小尾寒羊F1代杂交肉用羯羊,随机分为11个处理,每个处理6个重复,每个重复1只羊。采用随机区组设计,分别测定11种不同粗饲料组成的饲粮的营养物质含量,通过物质代谢试验和气体代谢试验测定这11种饲粮的营养物质消化率、消化能(DE)及ME,在分析饲粮营养物质含量、可消化营养物质、DE和ME的基础上,筛选出最佳估测因子并建立估测方程。结果表明:饲粮干物质(DM)、有机物(OM)、粗蛋白质(CP)、总能(GE)消化率与饲粮中CP、GE和OM含量呈显著或极显著正相关(P0.05或P0.01),与中性洗涤纤维(NDF)含量呈显著负相关(P0.05);饲粮NDF消化率与饲粮中DM、OM、CP、GE含量达到显著或极显著负相关(P0.05或P0.01),与NDF含量达到极显著正相关(P0.01)。利用饲粮中营养物质含量对ME进行估测的最佳方程为ME=-49.593+0.594OM-0.107NDF(R2=0.949,P0.01)。由此得出,饲粮营养物质消化率、ME与营养物质含量均有较强的相关性,可通过营养物质含量对饲粮的营养物质消化率、ME进行合理估测。 相似文献
2.
本试验旨在研究日粮脂肪酸组成对生长期银狐生长性能、营养物质消化率及氮代谢的影响.选取12周龄左右、体重相近的健康雄性银狐20只,随机分成2组,每组10个重复,每个重复1只,分别饲喂在基础日粮中添加10%豆油(豆油组)和10%混合油脂(鸡油:豆油=1:1)(混合油脂组)的试验日粮.试验期151 d,分为育成期(90～145日龄)和冬毛期(146～240日龄)2个阶段.结果表明,日粮脂肪酸组成对育成期和冬毛期银狐的干物质采食量和料重比均无显著影响(P>0.05),但对育成期银狐日增重有显著影响(P<0.05),表现为豆油组显著高于混合油脂组(P<0.05);日粮脂肪酸组成对育成期和冬毛期银狐的蛋白质表观消化率和碳水化合物表观消化率均无显著影响(P>0.05),但对育成期银狐脂肪表观消化率有显著影响(P<0.05),表现为豆油组显著高于混合油脂组(P<0.05);日粮脂肪酸组成对育成期银狐的氮代谢无显著影响(P>0.05),但对冬毛期银狐的蛋白质生物学效价和氮沉积有显著影响(P<0.05),表现为混合油脂组分别显著和极显著高于豆油组(P<0.05;P<0.01).综合本试验测定指标,建议育成期银狐以豆油作为日粮脂肪主要来源生产性能较好,而冬毛期以混合油脂(鸡油:豆油=1:1)作为日粮脂肪主要来源效果最佳. 相似文献
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4.
S. Dänicke E. Franke E. Strobel H. Jeroch O. Simon 《Journal of animal physiology and animal nutrition》1999,81(2):90-102
Xylanase supplementation of rye-based diets which contained 10% beef tallow was shown to markedly improve the digestibility of fat whereas the enzyme effect in diets containing 10% soya oil was much less pronounced (Dänicke et al. 1997b). Such interactions between fat type and xylanase supplementation have also been reported for wheat–rye-based diets (Langhout et al. 1997) and wheat-based diets (Allen et al. 1997) and were attributed mainly to the fatty acid composition of different types of fat and to changes in digesta viscosity caused by soluble pentosan. The apparent metabolizable energy, N-corrected (AMEN ) contents of such diets were affected in a similar manner suggesting that energy metabolism is also influenced by xylanase supplementation and the type of dietary fat. However, changes in the metabolizability of gross energy does not necessarily indicate whether the efficiency of metabolizable energy (ME) for energy gain is changed nor if different proportions of ME are used for maintaining an energy equilibrium, i.e. ME maintenance requirement. In addition, studies suggest that both dietary fat level and fat type might exert effects on the efficiency of utilization of ME for energy retention (Carew and Hill 1964; de Groote et al. 1971; Fuller and Rendon 1979; Brue and Latshaw 1985). Hence, the aim of this study was to investigate the partitioning of ME between maintenance needs and energy retained as protein and as fat when feeding rye-based diets. The diets contained either soya oil or beef tallow and were either unsupplemented or xylanase-supplemented. 相似文献
5.
Pengfei Li Xiangshu Piao Zhikai Zeng Ding Wang Lingfeng Xue Rongfei Zhang Bing Dong Sung Woo Kim 《畜牧与生物技术杂志(英文版)》2011,2(1)
A total of 480 nursery pigs(Duroc×Landrace×Large White) were utilized in two experiments conducted to determine the effects of different ratios of standardized ileal digestible lysine(SIDLys)to metabolizable energy(ME)ratio on the performance,nutrient digestibility,plasma urea nitrogen (PUN),and plasma free anlino acids of 10 to 28 kg pigs.In Exp.1,192 pigs(10.58 kg)were assigned to one of four treatments.,The treaunents consisted of diets with a ME content of 3.2,3.25,3.3,or 3.35 McaL/kg with a constant SID-Lys:ME ratio of 3.7 g/Meal.The experiment lasted 28 days.Pigs which were fed the diets containing 3.3 and 3.35 Mcal/kg ME had lower feed intakes(P<0.05)than those fed 3.2 Mcal/kg.Feed efficiency was linearly improved with increasing dietary ME(P<0.05).Increasing the dietary ME level also increased (P<0.05)dry matter and energy digestibility.Therefore.3.3 Mcal/kg ME Was selected for Exp.2in which 288 pigs(10.60 kg)were assigned to one of six treatments.Treatments consisted of SID-Lys:ME ratios of 3.1,3.3,3.5,3.7,3.9,or 4.1 g/Meal witIl all diets providing 3.3 Meal of ME/kg.Weight gain and feed efficiency were increased(P<0.05)as the SID-Lys:ME ratio in diet increased.Based on a straight broken-line model,the estimated SID-Lys:ME ratio to maximize weight gain was 3.74. 相似文献
6.
Tuula Dahlman Jarmo Valaja Paavo Niemelä Taina Jalava 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2013,63(4):174-182
The influence of dietary protein content and composition on growing-furring blue fox ( Alopex lagopus ) was studied with three protein levels [15%, 22.5% and 30% of metabolizable energy (ME) from protein]. The two lowest diets were fed as such, or as supplemented with L-methionine or lysine. Growth, from the start of the experiment in July to mid-September, improved with increasing protein level ( P < 0.01). Lysine supplementation, unlike methionine, decreased early growth ( P <0.05). During the last months of the experimental period, differences in weight gain between the groups evened out. Skin length and quality declined with decreasing protein level ( P <0.05). Methionine and lysine had opposite effects on skin length ( P <0.10). For normal body growth and skin length, a level of 0.40 g of digestible L-methionine MJ -1 ME, and 25-32% protein in feed dry matter, was required. When feed ingredients are deficient in methionine, a supplementation is recommended. Methionine is the first limiting amino acid of the two amino acids studied here. 相似文献
7.
Nutritional strategies to cope with reduced litter weight gain and total tract digestibility in lactating sows 
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下载免费PDF全文 J. Álvarez‐Rodríguez L. Mir A. R. Seradj H. Morazán J. Balcells D. Babot 《Journal of animal physiology and animal nutrition》2017,101(5):914-924
Twelve lactating sows were used to evaluate the effects of reducing dietary crude protein (CP) (14% vs. 12%) and increasing neutral detergent fibre (NDF) levels (18% vs. 22%) on litter performance, total tract apparent digestibility and manure composition in a 4 × 4 latin square arrangement during a 36‐day lactation period. Diets were isoenergetic (2.9 Mcal ME/kg) and had similar total lysine content (0.9%). In addition, a second aim was to compare a reference external marker method (Cr2O3) with an internal feed marker [acid‐insoluble ash (AIA)] for the calculation of apparent total tract digestibility of nutrients in lactating sows. The reduction of dietary CP level in lactating sows had no effect on either live‐weight or backfat thickness or apparent total tract digestibility of nutrients. However, the piglets' average daily gain (ADG) was reduced in low dietary CP diets, which suggests that sows reduced milk production due to an underestimation of certain essential amino acid requirements (e.g. valine). The increase of dietary NDF level did not affect sow and litter performance. Nevertheless, the total tract apparent digestibility of organic matter, CP and carbohydrates was reduced, and ether extract digestion was increased in high NDF compared to normal NDF diets equally balanced for ME and lysine content. The coefficients of total tract apparent digestibility of nutrients in lactating sows were greater when using AIA compared to Cr2O3 marker, regardless of dietary CP or NDF level, but their coefficients of variation were lower in the former than in the latter. In lactating sows, a trade‐off between litter performance and nutrient digestion is established when reducing dietary CP or increasing NDF levels while maintaining similar lysine content through synthetic amino acids and balancing metabolizable energy through dietary fat sources. 相似文献
8.
本试验旨在研究饲粮玉米油与棕榈酸配比对冬毛期蓝狐生产性能、营养物质消化率及氮代谢的影响。选取120日龄体重相近的健康雄性蓝狐60只,随机分成6组,每组10个重复,每个重复1只蓝狐。各组分别饲喂玉米油与棕榈酸配比为0∶12(Ⅰ组)、3∶9(Ⅱ组)、5∶7(Ⅲ组)、7∶5(Ⅳ组)、9∶3(Ⅴ组)和12∶0(Ⅵ组)的试验饲粮。预试期7 d,正试期67 d。结果表明:1)饲粮玉米油与棕榈酸配比对冬毛期蓝狐平均日增重有极显著影响(P0.01),对平均日采食量和料重比无显著影响(P0.05)。随着饲粮玉米油添加比例的升高,平均日增重逐渐升高。饲粮玉米油与棕榈酸配比对冬毛期蓝狐体长、针毛长度和绒毛长度均无显著影响(P0.05),Ⅵ组鲜皮长显著高于Ⅰ组(P0.05)。2)饲粮玉米油与棕榈酸配比对冬毛期蓝狐脂肪、碳水化合物和干物质消化率有极显著影响(P0.01),对蛋白质消化率无显著影响(P0.05)。3)饲粮玉米油与棕榈酸配比对冬毛期蓝狐食入氮、粪氮、尿氮、氮沉积、净蛋白利用率和蛋白质生物学价值均无显著影响(P0.05)。然而,氮沉积随饲粮中玉米油添加比例的升高呈上升趋势,Ⅰ组最低,Ⅵ组最高;净蛋白质利用率和蛋白质生物学价值均以Ⅴ组最高。综合各指标,从保证蓝狐生产性能和营养物质消化率考虑,冬毛期蓝狐干饲粮中玉米油与棕榈酸的适宜比例应当维持在9∶3(即亚油酸含量为3.76%)。 相似文献
9.
Two experiments were conducted to compare the nutritional value of normal and high-oil corn for pigs. The normal corn and the two varieties (high-oil corns A and B) of high-oil corn contained 4.41, 7.35 and 8.86% ether extract, on DM basis, respectively. In experiment 1, six non-littermate crossbred barrows (37.8 +/- 1.3 kg BW) were fitted with ileal T-cannulas and used in a double replicated Latin Square digestion trial. Three diets were formulated containing 96.6% of one of the three varieties of corn as the only protein source. Chromic oxide (0.4%) was added as a digestibility marker. Additional vitamins and minerals were added to meet requirements. The digestible energy concentrations for normal corn and high-oil corn A and B were 16.53, 16.99 and 17.07 MJ/kg while the metabolizable energy values were 15.82, 16.32 and 16.36 MJ/kg, on DM basis, respectively. The ileal amino acid digestibility of high-oil corn was generally higher than that of normal corn with significant differences being observed for the essential amino acids isoleucine and phenylalanine. In experiment 2, 96 pigs (8.01 +/- 0.14 kg BW) were used to evaluate four diets in a 2 x 2 factorial design conducted over a 35-day period. Corn variety (high-oil vs. normal corn) and nutrient density (high content of protein and ME vs. low content of protein and ME) were set as the two main effects. During the first 14 days, pigs fed high-oil corn diets consumed more feed and tended to get higher daily gain than pigs fed normal corn. Over the entire 35-day experiment, increasing dietary nutrient density increased daily gain and tended to increase feed conversion, while variety of corn had no significant effects on performance. Overall, the present results indicate that the energy concentration and ileal amino acid digestibility of high-oil corn varieties were equal or superior to those in normal corn and therefore they should be able to be effectively utilized in diets fed to swine. 相似文献
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本文旨在研究日粮不同代谢能和粗蛋白质水平对合浦鹅日粮干物质、粗蛋白质、粗脂肪、粗纤维、钙和磷等养分的消化率及生长性能的影响.将120只28日龄的合浦鹅随机分成6个组,进行2个饲养和消化试验:试验1组饲喂粗蛋白质水平为15.10%,代谢能水平分别为10.03、11.00和11.85 MJ/kg的3种日粮;试验2组饲喂代谢能水平为11.50 MJ/kg,粗蛋白质水平分别为12.50%、14.85%和17.83%的3种日粮.用4 mol/L HCI ALA方法测定日粮的养分消化率.结果表明:粗蛋白质水平为15.10%和代谢能水平为10.03 MJ/kg的日粮,具有较高的养分消化率,但不同代谢能水平对试鹅的生长性能影响差异不显著(P>0.05);代谢能水平为11.50 MJ/kg和粗蛋白质水平为12.50%的日粮也具有较高的养分消化率,但不同粗蛋白质水平对试鹅的生长性能影响差异也不显著(P>0.05).因此,28日龄以后的合浦鹅的日粮粗蛋白质和代谢能水平分别为15.10%和10.03 MJ/kg,或分别为12.50%和11.50 MJ/kg时,均具有较高的养分消化率,但对合浦鹅的生长性能无显著影响. 相似文献
11.
Birthe M. Damgaard Tove N. Clausen Søren K. Jensen Ricarda M. Engberg 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2013,63(1):19-29
The effects of different dietary levels of marine lipids in the diets with a constant distribution of metabolizable energy (ME) on protein, fat and carbohydrate were investigated in male mink kits in the growing-furring period during 2 consecutive years. The physiological investigations included 15 males per experimental group, each consisting of about 75 males. Fat herring and mackerel scrap were used in amounts resulting in levels of marine lipids of 30, 50 and 70% of total dietary lipid, respectively. Defatted herring scrap was used in proportions of 12, 23 and 32% in the diets. Haematocrit value, haemoglobin concentration, number of erythrocytes, leucocytes and platelets, plasma activities of alanine aminotransferase (ALAT), aspartate aminotransferase (ASAT) and creatine kinase (CK), concentrations of tocopherols in plasma, liver and adipose tissue, composition of fatty acids (FA) in liver and adipose tissue, body weight, weight of liver and heart in relation to body weight, and liver fat content were studied. The number of platelets decreased with an increasing proportion of marine lipids of total content of dietary lipids. A high intake of fatty fish products had no influence on the health status of the animals evaluated by haematological and clinical-chemical analyses, vitamin E status and FA composition in growing-furring male mink. No negative effects on the health of the animals were demonstrated when feeding with defatted herring scrap. 相似文献
12.
本试验旨在研究饲粮精氨酸添加水平对冬毛期雌性蓝狐生产性能、营养物质消化率及氮代谢的影响。选取120日龄、体重相近的60只健康雌性蓝狐,随机分为6组,每组10个重复,每个重复1只。各组饲粮精氨酸添加水平分别为0(对照组)、0.2%、0.4%、0.6%、0.8%和1.0%,预试期7 d,正试期80 d。结果表明:1)0.6%添加组蓝狐的平均日增重极显著高于其他各组(P0.01),体长和皮长较对照组分别提高了1.42%和1.26%(P0.05),料重比极显著低于对照组(P0.01);0.4%添加组蓝狐平均日采食量显著低于对照组(P0.05)。2)饲粮精氨酸添加水平极显著影响蓝狐脂肪消化率(P0.01),各组蓝狐脂肪消化率随着饲粮精氨酸添加水平的升高而提高;0.6%添加组干物质消化率极显著高于对照组和0.2%、0.4%添加组(P0.01),饲粮精氨酸添加水平对蓝狐蛋白质消化率和碳水化合物消化率无显著影响(P0.05)。3)0.4%添加组蓝狐食入氮显著低于除0.6%添加组外其他各组(P0.05);0.6%添加组粪氮和尿氮含量均最低,而氮沉积、净蛋白质利用率、蛋白质生物学价值和蛋白质效率比均最高。综合各项指标,冬毛期雌性蓝狐饲粮中添加0.6%精氨酸(饲粮总精氨酸水平为2.04%)可提高平均日增重,降低料重比。 相似文献
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Soybean hulls as a dietary fiber source for dogs. 总被引：4，自引：0，他引：4
J T Cole G C Fahey N R Merchen A R Patil S M Murray H S Hussein J L Brent 《Journal of animal science》1999,77(4):917-924
In Exp. 1, soybean hull samples were obtained from nine sources across the United States and analyzed for nutrient content to determine their suitability for inclusion in dog diets. Compositional data revealed variation in both the amount of total dietary fiber (TDF; 63.8 to 81.2%) in the soybean hulls and the ratio of insoluble:soluble fiber (5.0:1 to 15.4:1). Crude protein content varied widely among sources, ranging from 9.2 to 18.7%. An in vivo trial (Exp. 2) was conducted using a premium dog diet containing 3.0, 4.5, 6.0, 7.5, or 9.0% soybean hulls (DM basis). There was a negative linear effect (P < .05) of soybean hull inclusion in the diet on DM, OM, TDF, and GE total-tract digestibilities, as well as on calculated ME. Crude protein and fat digestibilities were unaffected by treatment. Based on these results, ileally cannulated dogs were fed diets containing 6.0, 7.5, or 9.0% soybean hulls (DM basis) in addition to diets containing either 0% supplemental fiber or 7.5% beet pulp (Exp. 3). Nutrient digestion at the ileum was unaffected by inclusion of supplemental fiber. Total tract digestion of DM, OM, and GE was lower ( P < .05) for diets containing supplemental fiber when compared with the diet containing 0% fiber. Crude protein and fat digestibilities were unaffected by treatment. There was no difference in nutrient digestibility between those diets containing soybean hulls and a diet containing beet pulp. Soybean hull inclusion in the diet resulted in a negative linear effect (P < .05) on calculated ME, in addition to lowering ME (P < .05) when compared with the 0% fiber control diet. Calculated ME for dogs fed a 7.5% beet pulp-containing diet was lower (P < .05) than that for dogs fed the soybean hull-containing diets. Results indicate that soybean hulls can be an effective dietary fiber source in dog diets. 相似文献
14.
《The Journal of Applied Poultry Research》2007,16(4):481-493
Bovans White Leghorn pullets were utilized to evaluate the use of an enzyme cocktail from 0 to 126 d of age. Dietary treatments varied in CP, ME, and enzyme (EZ) supplementation. Feed intake, BW gain, and feed conversion ratio data were gathered in addition to determining nutrient retention and digestibility during the trial. Cumulatively, feed consumption was decreased by EZ supplementation when added to a required ME diet. Body weight gains were similar across dietary treatments; however, cumulative feed conversion ratio was significantly improved with EZ supplementation. Interactions regarding nutrient retention and digestibility were numerous. Similar responses were noted for energy and protein retention values during the trial with changes in response to dietary treatments as the pullets aged. Compared with feeding an industry applicable diet (required ME/CP without EZ − $0.27/lb gain), all dietary treatments reduced production costs with significant reductions when reducing CP. Lowest feed cost ($)/lb gain and percent excreta N was feeding pullets a diet with reduced ME and CP supplemented with EZ ($0.262/lb gain; 5.19% N). Possible further reductions in ME or dietary CP, or both, with EZ supplementation may prove to be even more economical and environmentally friendly. 相似文献
15.
Feeding different dietary protein to energy ratios to Holstein heifers: effects on growth performance,blood metabolites and rumen fermentation parameters 下载免费PDF全文
下载免费PDF全文 L. F. Dong W. B. Zhang N. F. Zhang Y. Tu Q. Y. Diao 《Journal of animal physiology and animal nutrition》2017,101(1):30-37
Eighteen Chinese Holstein heifers average age 230 ± 14 days were allocated to 1 of 3 dietary crude protein (CP) to metabolizable energy (ME) ratios to examine the effects on growth performance, blood metabolites and rumen fermentation parameters with 90‐days experiment. Three different dietary CP:ME ratios were targeted based on the formulation of dietary CP contents of 10.85%, 12.78% and 14.63% on dry matter (DM) basis with similar ME contents (10.42 MJ/kg DM), which were categorized as low, medium and high dietary CP:ME ratios. The actual CP:ME ratios obtained in this study significantly increased from low to high CP:ME ratio groups with a value of 10.59, 11.83 and 13.38 g/MJ respectively. Elevated CP:ME ratios significantly increased CP intake (kg/day) and feed efficiency (FE) which was defined as dry matter intake as a proportion of average daily gain (ADG), whereas little difference was observed in body weight (kg), ADG (kg/day), DM intake (kg/day) and ME intake (MJ/day) among the three different CP:ME ratio groups. Increasing dietary CP to ME ratios significantly increased CP digestibility, whereas digestibility of DM and gross energy remained constant in the current experiment. Blood urea nitrogen and insulin‐like growth factor‐1 linearly increased with increasing dietary CP:ME ratios. There was significantly dietary treatment effect on rumen fermentation parameters including acetate, propionate, butyrate and total volatile fatty acids. Therefore, this study indicated that increasing dietary CP levels with similar energy content contributed to increased protein intake and its digestibility, as well as FE. Holstein heifers between 200 and 341 kg subjected to 13.38 dietary CP:ME ratio showed improved feed efficiency, nutrient digestibility, some blood metabolites and rumen fermentation characteristics for 0.90 kg/day rate of gain. 相似文献
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依据紫貂育成期饲粮适宜能量及蛋能比的研究结果,按原料比例不同,共设4个干配合料试验日粮配方。选用60～70日龄紫貂100只,随机分配到4个试验组和对照组(每组雄貂12只,雌貂8只)内。各试验组干配合料占日粮比例(占总能的％)为21％,对照组全喂鲜料。在饲养试验中期对40只幼貂(每组选雄貂4只,雌貂4只)进行消化代谢试验。结果表明,各试验组与对照组之问增重、毛皮质量、死亡率及自咬症发病率差异均不显著。各试验组与对照组间在能量消化率、能量代谢率上差异显著(P<0.05)或极显著(P<0.01)。各试验组蛋白质消化率与对照组间差异极显著(P<0.01),而代谢率各组间无显著差异(P>0.05)。综合分析表明,干配合饲料可部分替代鲜料。 相似文献
17.
本试验旨在研究饲粮铜水平对冬毛期雌性蓝狐生长性能、营养物质消化率、血清生化指标及毛皮品质的影响。试验选取115日龄左右的健康雌性蓝狐50只,随机分成5组,每组10个重复,每个重复1只。以五水硫酸铜(Cu SO_4·5H_2O)为铜源,在基础饲粮中分别添加0、12.22、32.22、72.22、152.22 mg/kg的铜配成5种试验饲粮,5种试验饲粮铜水平分别为7.78(Ⅰ组,作为对照组)、20(Ⅱ组)、40(Ⅲ组)、80(Ⅳ组)、160 mg/kg(Ⅴ组)。预试期为7 d,正试期为60 d。结果表明:1)Ⅲ、Ⅳ和Ⅴ组蓝狐的平均日增重显著高于对照组(P0.05),料重比显著低于对照组(P0.05);各组蓝狐的终末体重及平均日采食量差异不显著(P0.05)。2)各组蓝狐的干物质消化率、蛋白质消化率及氮沉积差异不显著(P0.05);Ⅲ、Ⅳ组蓝狐的脂肪消化率显著高于对照组(P0.05),其他各组间差异不显著(P0.05);铜排出量随着饲粮铜水平的升高极显著的增加(P0.01)。3)Ⅴ组蓝狐血清总蛋白和白蛋白含量显著高于对照组和Ⅱ组(P0.05);Ⅴ组蓝狐血清尿素氮含量显著高于Ⅱ组(P0.05);各组蓝狐血清铜蓝蛋白活性差异不显著(P0.05),Ⅳ组蓝狐血清铜锌超氧化物歧化酶活性显著高于对照组及Ⅱ和Ⅲ组(P0.05)。4)Ⅴ组蓝狐肝脏铜含量显著高于对照组(P0.05),血清铜、锌、铁含量各组间差异不显著(P0.05)。5)饲粮铜水平并未显著影响蓝狐的体长和干皮长(P0.05);Ⅲ和Ⅴ组蓝狐针毛长和绒毛长显著大于Ⅱ和Ⅳ组(P0.05);Ⅴ组蓝狐皮张颜色显著深于对照组(P0.05)。由此可见,在饲粮中添加32.22 mg/kg铜即铜水平为40.00 mg/kg时,冬毛期雌性蓝狐可获得较好的生长性能、营养物质消化率及毛皮品质,同时铜的排放量较低。 相似文献
18.
Fiaz M Abdullah M Nasir M Javed K Babar ME Pasha TN Jabbar MA 《Tropical animal health and production》2012,44(5):975-981
The aim of the study was to determine optimum dietary energy level during the last trimester of pregnancy for Sahiwal heifers
in subtropical Pakistan. Sixteen Sahiwal heifers, 5–6 months pregnant, were assigned to four dietary treatments with four
heifers on each treatment. Isonitrogenous (CP = 14.1%) diets having varying energy, namely, ME 88%, ME 100% (Control), ME
112% and ME 124% of NRC recommended level for pregnant heifers, were fed until calving. All were fed a similar diet after
calving. Precalving weight gain was highest (P < 0.05) in heifers fed ME 112 and 124% (486 ± 13 and 497 ± 5 g/day, respectively) followed by ME 100% (444 ± 7 g/day), and
the lowest weight gain was recorded for ME 88% (397 ± 8 g/day). A similar trend was observed for feed efficiency. Body condition
score at calving in groups ME 124% and ME 112% was higher than ME 88% and ME 100%. Nutrient digestibility, birth weight of
calves and milk composition except fat content were not influenced by energy levels. The highest daily milk yield was observed
in heifers fed ME 100% followed by ME 112, 124, and 88%. We conclude that the NRC recommendation is applicable to the subtropical
region. 相似文献
19.
日粮组成对成年牦牛消化和能量代谢的影响 总被引：1，自引：0，他引：1
在海拔3980m的果洛州大武乡对3头成年牦牛饲喂3种不同的日粮,按3×3拉丁方设计安排消化代谢试验,结果表明：（1）随日粮中精料比例的增加,粗蛋白的消化率逐渐升高,而其它各营养成分的消化率则逐渐降低,且日粮粗蛋白、粗灰分和能量消化率之间的差异显著（P〈0.05）,干物质和有机物质消化率之间的差异不显著（P〉0.05）;（2）能量代谢率和消化能转化为代谢能的效率之间的差异显著（P〈0.05）,且其平均转化效率为0.77;（3）钙、磷食入量之间的差异不显著（P〈0.05）,磷存留量随日粮中精料比例的增加而增加;钙存留量在B日粮下最大,B日粮显著高于A和C日粮。 相似文献
20.
1. Protein, fat and energy retentions of chicks fed on diets containing medium chain triglyceride (MCT) and long chain triglyceride (LCT), at 100 and 200 g fat/kg diet, were investigated. Maize oil was used as the LCT source. The MCT used was glyceryl tricaprylate. 2. Body weight gain and food intake were decreased with the diets containing MCT and these effects were greater at the higher fat concentration. Protein retention was also reduced by dietary MCT, although the efficiency of protein utilisation (protein retained/protein intake) was not altered. 3. The values for fat and energy retentions were significantly lower in the chicks fed on the MCT-supplemented diets than in those receiving the LCT-containing diets. Dietary ME values and efficiencies for energy utilisation (energy retained/ME intake) were also reduced by dietary MCT. 相似文献