Scientia Agricultura Sinica ›› 2021, Vol. 54 ›› Issue (16): 3537-3548.doi: 10.3864/j.issn.0578-1752.2021.16.015

• ANIMAL SCIENCE·VETERINARY SCIENCE·RESOURCE INSECT • Previous Articles     Next Articles

Energy and Protein Requirements of Alpine Merino Growing Sheep

WANG Chen1(),ZHANG HongWei1(),WANG HuCheng1(),SUN XiaoPing2,LI FaDi1,YANG BoHui2()   

  1. 1State Key Laboratory of Grassland Agro-ecosystems, Lanzhou University/Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs/Institute of ruminant research, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020
    2Lanzhou Institute of Animal Science & Veterinary Pharmaceutics, Chinese Academy of Agricultural Sciences, Lanzhou 730050
  • Received:2020-06-29 Accepted:2021-01-25 Online:2021-08-16 Published:2021-08-24
  • Contact: HuCheng WANG,BoHui YANG E-mail:wangch18@lzu.edu.cn;zhanghw18@lzu.edu.cn;wanghuch@lzu.edu.cn;yangbh2004@163.com

Abstract:

【Objective】The objective of this study was to determine the energy and protein requirements of Alpine Merino growing sheep, which could provide basic data and theoretical support for the formulation of feeding standards. 【Method】 It was selected that forty eight 14-month old Alpine Merino growing male sheep (n = 24, an initial body weight of 42.96 ± 3.13 kg) and female sheep (n = 24, an initial body weight of 32.85 ± 3.21 kg). The experiment lasted for 40 days, including 5-day transition period, 10-day pre-trial period and 25-day formal period. In the transition period, oat hay was fed in the morning and evening every day, and a small amount of total mixed pellet feed was fed at noon to realize the transition from forage to pellet feed; in the pre-trial period, the sheep were free to eat the whole mixed pellet feed in a single pen, and the feed intake was recorded; in the formal period, the sheep were grouped according to the feed intake of the pre-trial period feeding, growing male and female sheep were divided into 4 groups, fed with 4 levels of free feeding (AL group), 80% (IR80 group), 60% (IR60 group) and 40% (IR40 group) with 6 replicates in each group and 1 sheep in each replicate. In the last five days of the formal period, the digestion and metabolism trials were carried out continuously with the method of total collection of feces and urine. During this period, the feeds, feces and urine of each sheep were accurately recorded and collected. In the last two days, the respiratory calorimetry was carried out by the indirect calorimetry of respiratory mask to determine the growth performance, energy utilization and nitrogen balance indexes. The energy and protein requirements of Alpine Merino growing sheep were obtained by regression analysis. 【Result】 There was no significant difference in the initial weight between the growing male and female sheep (P>0.05). With the decrease of feed intake level, the final weight, average daily gain, dry matter intake, gross energy intake, fecal energy, digestible energy, metabolic energy, retained energy, nitrogen intake, fecal nitrogen, digestible nitrogen, retained nitrogen, retained nitrogen/nitrogen intake and retained nitrogen/digestible nitrogen decreased significantly, that is, AL>IR80>IR60>IR40 (P<0.05). However, feed intake level had significant effect on gas emission of Alpine Merino growing female sheep (P<0.05). Oxygen consumption and carbon dioxide production of IR40 group were significantly lower than those of the other three groups (P<0.05). With the decrease of feed intake level, the total energy digestibility, total energy metabolic rate and nitrogen apparent digestibility of male sheep increased significantly (P<0.05). The maintenance requirements of NE, ME, the efficiencies of ME utilisation for maintenance, every 1 g·kg -1BW0.75·d-1 body weight gain, DE, ME and NE of Alpine Merino growing male and female sheep were 227, 213 kJ·kg-1BW0.75·d-1, 283, 279 kJ·kg-1BW0.75·d-1, 0.80, 0.76, 760, 830 kJ·kg-1BW0.75·d-1, 570, 750 kJ·kg-1BW0.75·d-1, and 290, 370 kJ·kg-1BW0.75·d-1, respectively. Every 1 g·kg-1BW0.75·d-1 body weight gain, the maintenance requirements of net nitrogen, NPm, CPI and DCP of Alpine Merino growing male and female sheep were 220.8, 190.4 mg·kg-1BW0.75·d-1, 1.38, 1.19 g·kg-1BW0.75·d-1, 7.75, 6.55 g·kg-1BW0.75·d-1, 6.02, and 4.38 g·kg-1BW0.75·d-1, respectively. 【Conclusion】The results of this study showed that the energy and protein requirements of Alpine Merino sheep were different from the established sheep recommended values, which might be related to factors such as breed, physiological condition, age and environment. In addition, the model established in this study could be used to estimate the energy and protein requirements of Alpine Merino sheep.

Key words: Alpine Merino growing sheep, growth performance, energy, protein, requirements

Table 1

The composition and nutrient levels of diets (DM basis, %)"

项目
Items
含量 Content 营养水平 Nutrient levels
育成公羊
Growing male sheep
育成母羊
Growing female sheep
育成公羊
Growing male sheep
育成母羊
Growing female sheep
原料 Ingredients
玉米秸秆 Corn straw 40.00 45.00 代谢能 ME (MJ·kg-1) 10.69 10.20
苜蓿草粉 Alfalfa hay 10.00 10.00 干物质 DM (风干物质基础) 89.34 90.20
玉米 Corn grain 32.99 31.37 有机物 OM 90.40 89.04
麸皮 Wheat bran 1.00 1.00 中性洗涤纤维 NDF 51.05 44.53
豆粕 Soybean meal 5.61 1.00 酸性洗涤纤维 ADF 24.02 22.88
棉粕 Cottonseed meal 2.00 2.00 粗蛋白质 CP 11.10 9.43
玉米胚芽 Corn germ 1.83 2.40 钙 Ca 0.44 0.50
膨润土 Bentonite 0.75 1.41 总磷 TP 0.31 0.28
糖蜜 Molasses 4.00 4.00
食盐 NaCl 0.71 0.71
预混料 Premix 1.11 1.11
合计 Total 100.00 100.00

Table 2

Effects of feed intake level on growth performance of Alpine Merino growing sheep"

性别
Gender
项目
Items
组别 Groups SEM P
AL IR80 IR60 IR40
育成公羊
Growing male sheep
初重 IBW (kg) 52.33 51.66 49.75 51.17 0.44 0.231
末重 FBW (kg) 59.30a 56.70a 51.40b 48.17b 1.11 <0.001
平均日增重 ADG (g·d-1) 242.65a 172.06bc 51.47d -95.59e 33.84 <0.001
干物质采食量 DMI (kg·d-1) 2.56a 2.18b 1.66c 1.09d 0.12 <0.001
料重比 F/G 9.09b 12.40b 31.09a 11.26c 4.60 <0.001
育成母羊
Growing female sheep
初重 IBW (kg) 40.17 40.33 39.28 40.08 0.73 0.964
末重 FBW (kg) 42.42a 42.42a 39.17ab 36.75b 0.76 0.009
平均日增重 ADG (g·d-1) 187.50a 115.91a -5.68b -153.41c 34.99 <0.001
干物质采食量 DMI (kg·d-1) 1.97a 1.68b 1.26c 0.85d 0.09 <0.001
料重比 F/G 9.57ab 11.78a -18.23c -4.55bc 3.42 <0.001

Table 3

Effects of feed intake level on gas metabolism of Alpine Merino growing sheep"

性别
Gender
项目
Items
组别 Groups SEM P
AL IR80 IR60 IR40
育成公羊
Growing male sheep
氧气 O2 (L·d-1) 305.3 346.7 357.24 284.79 14.90 0.282
二氧化碳 CO2 (L·d-1) 312.5 321.81 335.70 251.59 15.68 0.356
甲烷 CH4 (L·d-1) 8.51 9.74 10.80 6.18 1.49 0.763
育成母羊
Growing female sheep
氧气 O2 (L·d-1) 283.98a 274.39a 288.06a 224.49b 9.46 0.042
二氧化碳 CO2 (L·d-1) 260.54a 285.36a 267.66a 207.97b 10.93 0.016
甲烷 CH4 (L·d-1) 8.43ab 15.97a 3.90b 3.11b 1.79 0.022

Table 4

Effects of feed intake level on energy utilization of Alpine Merino growing sheep"

性别
Gender
项目
Items
组别 Groups SEM P
AL IR80 IR60 IR40
育成公羊
Growing male sheep
食入总能 GEI (MJ·d-1) 36.74a 32.64b 24.43c 16.60d 2.00 <0.001
粪能 FE (MJ·d-1) 16.35a 13.99b 8.80c 5.29d 1.14 <0.001
尿能 UE (MJ·d-1) 0.61 0.65 0.77 0.62 0.06 0.79
甲烷能 CH4E (MJ·d-1) 0.34 0.39 0.43 0.24 0.06 0.763
产热量 HP (MJ·d-1) 6.42 7.13 7.35 5.77 0.31 0.271
消化能 DE (MJ·d-1) 20.39a 18.65b 15.64c 11.31d 0.94 <0.001
代谢能 ME (MJ·d-1) 19.44a 17.61a 14.44b 10.44c 0.93 <0.001
净能 NE (MJ·d-1) 9.89a 8.96a 7.35b 5.31c 0.48 <0.001
能量沉积量 RE (MJ·d-1) 13.02a 10.47a 7.09b 4.67b 0.91 <0.001
总能消化率 DE/GE (%) 55.42b 57.13b 64.00a 68.11a 1.52 <0.001
总能代谢率 ME/GE (%) 52.83b 53.95b 59.11ab 62.92a 1.33 0.007
消化能代谢率 ME/DE (%) 95.31 94.36 92.34 92.37 0.52 0.087
育成母羊
Growing female sheep
食入总能 GEI (MJ·d-1) 30.69a 24.55b 18.26c 12.38d 1.81 <0.001
粪能 FE (MJ·d-1) 12.02a 8.56b 6.30c 3.98d 0.80 <0.001
尿能 UE (MJ·d-1) 0.21 0.17 0.18 0.18 0.01 0.866
甲烷能 CH4E (MJ·d-1) 0.33ab 0.63a 0.15b 0.12b 0.07 0.022
产热量 HP (MJ·d-1) 5.78 5.75 5.89 4.56 0.22 0.082
消化能 DE (MJ·d-1) 18.66a 15.99b 11.96c 8.39d 1.08 <0.001
代谢能 ME (MJ·d-1) 18.12a 15.19b 11.62c 8.09d 1.06 <0.001
净能 NE (MJ·d-1) 8.94a 7.49b 5.73c 3.99d 0.51 <0.001
能量沉积量 RE (MJ·d-1) 12.34a 9.43a 5.73b 3.54b 1.00 <0.001
总能消化率 DE/GE (%) 60.64 65.14 65.49 67.8 1.21 0.211
总能代谢率 ME/GE (%) 58.84 61.86 63.63 65.38 1.29 0.346
消化能代谢率 ME/DE (%) 96.98 94.78 97.17 96.43 0.47 0.267

Table 5

Effects of feed intake level on nitrogen balance of Alpine Merino growing sheep"

性别
Gender
项目
Items
组别 Groups SEM P
AL IR80 IR60 IR40
育成公羊
Growing male sheep
氮采食量 NI (g·d-1) 39.07a 34.71b 25.98c 17.65d 2.13 <0.001
粪氮 FN (g·d-1) 12.33a 10.66a 5.88b 3.31c 0.99 <0.001
尿氮 UN (g·d-1) 11.48 11.39 15.22 14.58 0.69 0.074
消化氮 DN (g·d-1) 26.74a 24.04a 20.10b 14.34c 1.27 <0.001
氮表观消化率 NAD (%) 68.33b 69.28b 77.37a 81.25a 1.71 0.003
沉积氮 RN (g·d-1) 15.26a 12.65a 4.88b -0.23c 1.64 <0.001
沉积氮/氮采食量 RN/IN (%) 39.07a 36.45a 18.79b -1.33c 4.43 <0.001
沉积氮/消化氮 RN/DN (%) 57.55a 52.75a 24.30b -1.65c 6.48 <0.001
育成母羊
Growing female sheep
氮采食量 NI (g·d-1) 25.73a 20.59b 15.31c 10.38d 1.52 <0.001
粪氮 FN (g·d-1) 10.78a 6.88b 3.85c 2.38d 0.84 <0.001
尿氮 UN (g·d-1) 8.04b 10.13a 11.34a 10.28a 0.40 0.032
消化氮 DN (g·d-1) 14.95a 13.70a 11.46b 8.00c 0.74 <0.001
氮表观消化率 NAD (%) 57.86c 66.56b 74.84a 77.07a 2.07 <0.001
沉积氮 RN (g·d-1) 6.91a 3.57b 0.12c -2.28d 0.91 <0.001
沉积氮/氮采食量 RN/IN (%) 26.90a 17.34b 0.77c -21.99d 4.88 <0.001
沉积氮/消化氮 RN/DN (%) 46.69a 26.09b 0.99c -28.38d 7.37 <0.001

Table 6

Predicted formulations for energy requirement of Alpine Merino growing sheep"

性别 Gender 需要量 Requirements 方程 Equations 相关系数 R2 P
育成公羊
Growing male sheep
维持净能 NEm (kJ·kg-1BW0.75·d-1) LgHP (kJ·kg-1BW0.75·d-1)=0.0005MEI (kJ·kg-1BW0.75·d-1)+2.3561 0.9250 <0.001
维持代谢能 MEm (kJ·kg-1BW0.75·d-1) RE (kJ·kg-1BW0.75·d-1)= -0.2831+0.9491MEI (kJ·kg-1BW0.75·d-1) 0.9845 <0.001
消化能 DE (MJ·kg-1BW0.75·d-1) DE(MJ·kg-1BW0.75·d-1)=0.0275ADG (g·kg-1BW0.75·d-1)+0.7553 0.9577 <0.001
代谢能 ME (MJ·kg-1BW0.75·d-1) ME (MJ·kg-1BW0.75·d-1)=0.0301ADG (g·kg-1BW0.75·d-1)+0.5729 0.9299 <0.001
净能 NE (MJ·kg-1BW0.75·d-1) NE (MJ·kg-1BW0.75·d-1)=0.0173ADG (g·kg-1BW0.75·d-1)+0.2927 0.9390 <0.001
育成母羊
Growing female sheep
维持净能 NEm (kJ·kg-1BW0.75·d-1) LgHP (kJ·kg-1BW0.75·d-1)=0.0005MEI (kJ·kg-1BW0.75·d-1)+2.3285 0.8452 <0.001
维持代谢能 MEm (kJ·kg-1BW0.75·d-1) RE (kJ·kg-1BW0.75·d-1)=-0.2796+0.9423MEI(kJ·kg-1BW0.75·d-1) 0.9944 <0.001
消化能 DE (MJ·kg-1BW0.75·d-1) DE (MJ·kg-1BW0.75·d-1)=0.0257ADG (g·kg-1BW0.75·d-1)+0.8345 0.9517 <0.001
代谢能 ME (MJ·kg-1BW0.75·d-1) ME (MJ·kg-1BW0.75·d-1)=0.0252ADG (g·kg-1BW0.75·d-1)+0.7540 0.9440 <0.001
净能 NE (MJ·kg-1BW0.75·d-1) NE (MJ·kg-1BW0.75·d-1)=0.0119ADG (g·kg-1BW0.75·d-1)+0.3687 0.9610 <0.001

Table 7

Predicted formulations for protein requirement of Alpine Merino growing sheep"

性别
Gender
需要量
Requirements
方程
Equations
相关系数
R2
P
育成公羊
Growing male sheep
维持净蛋白 NPm (g·kg-1BW0.75·d-1) RN (g·kg-1BW0.75·d-1)=0.5106NI (g·kg-1BW0.75·d-1)-0.2208 0.9491 <0.001
粗蛋白 CP (g·kg-1BW0.75·d-1) CP (g·kg-1BW0.75·d-1)=0.3664ADG (g·kg-1BW0.75·d-1)+7.7499 0.9836 <0.001
可消化蛋白 DCP (g·kg-1BW0.75·d-1) DCP (g·kg-1BW0.75·d-1)=0.2329ADG (g·kg-1BW0.75·d-1)+6.0190 0.9699 <0.001
育成母羊
Growing female sheep
维持净蛋白 NPm (g·kg-1BW0.75·d-1) RN (g·kg-1BW0.75·d-1)=0.3783NI (g·kg-1BW0.75·d-1)-0.1904 0.9708 <0.001
粗蛋白 CP (g·kg-1BW0.75·d-1) CP (g·kg-1BW0.75·d-1)=0.2024ADG (g·kg-1BW0.75·d-1)+6.5494 0.9675 <0.001
可消化蛋白 DCP (g·kg-1BW0.75·d-1) DCP (g·kg-1BW0.75·d-1)=0.0945ADG (g·kg-1BW0.75·d-1)+4.3766 0.9553 <0.001
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