Energy Requirements of Tan Sheep during Non-Pregnancy Period
This experiment was conducted to study the energy metabolism rule and requirements of Tan sheep during non-pregnancy period,and to provide a theoretical basis for the construction of scientific feeding system.A total of 48 Tan sheep with similar body weight of(33.79±1.33)kg and good body condition during non-pregnancy period were randomly divided into 4 groups with 4 replicates per group and 3 sheep per replicate.Sheep in the four groups were fed diets with digestible energy of 6.69(group Ⅰ),7.29(group Ⅱ),7.97(group Ⅲ)and 8.82 MJ/kg(group Ⅳ),respectively.The pre-trial period lasted for 7 days and the experi-mental period lasted for 30 days.The results showed as follows:1)the average daily gain(ADG)of Tan sheep was increased with dietary energy level increasing,and the ADG in group Ⅳ was extremely significantly higher than that in the other groups(P＜0.01),the ADG in group Ⅲ was extremely significantly higher than that in group Ⅰ(P＜0.01),and the ADG in group Ⅱ was significantly higher than that in group Ⅰ(P＜0.05).The dry matter intake(DMI)in group Ⅰ was significantly higher than that in group Ⅲ(P＜0.05),but there was no significant difference in DMI among the other groups(P＞0.05).2)The digestible energy in-take and metabolizable energy intake of Tan sheep were increased with dietary energy level increasing,the di-gestible energy intake in group Ⅳ was extremely significantly higher than that in groups Ⅰ and Ⅱ(P＜0.01),and significantly higher than that in group Ⅲ(P＜0.05);the metabolizable energy intake in group Ⅳ was ex-tremely significantly higher than that in the other three groups(P＜0.01),and the metabolizable energy intake in group Ⅲ was significantly higher than that in group Ⅰ(P＜0.05).3)The gross energy digestibility and gross energy metabolic rate of Tan sheep during non-pregnancy period were 52.42％to 59.85％and 43.14％to 51.36％,respectively.4)The regression equations of digestible energy requirement and metabolizable energy requirement with metabolic body weight(W0.75)and ADG for Tan sheep during non-pregnancy period were as follows:digestible energy requirement(MJ/d)=0.527 2W0.75+0.040ADG(R2=0.897,P＜0.0l);metabo-lizable energy requirement(MJ/d)=0.401 6W0.75+0.040ADG(R2=0.942,P＜0.01).According to the re-gression model,the metabolizable energy maintenance requirement for Tan sheep during non-pregnancy period is 401.6 kJ/kg W0.75,and the metabolizable energy requirement is 400.0 kJ for every 100 g daily gain.[Chi-nese Journal of Animal Nutrition,2024,36(9):5828-5836]
Tan sheepnon-pregnancy periodenergy requirementsenergy digestion and metabolism
万方数据
维普
