Energy Requirements of Yunnan Semi-Fine Wool Sheep during Pregnancy Period

WU Yuhan; XUE Bai; HONG Qionghua; LI Xiang; WANG Zhisheng; HU Anhai; WANG Lizhi; LU Mingli; PENG Quanhui

doi:10.3969/j.issn.1006-267x.2020.06.033

Chinese Journal of Animal Nutrition >

2020 , Vol. 32 >Issue 6: 2738 - 2746

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.06.033

Energy Requirements of Yunnan Semi-Fine Wool Sheep during Pregnancy Period

WU Yuhan ,
XUE Bai ,
HONG Qionghua ,
LI Xiang ,
WANG Zhisheng ,
HU Anhai ,
WANG Lizhi ,
LU Mingli ,
PENG Quanhui

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1. Institute of Animal Nutrition, Sichuan Agricultural University, Chengdu 611130, China;
2. Yunnan Animal Science and Veterinary Institute, Kunming 650224, China

Received date: 2019-12-24

Online published: 2020-06-16

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Abstract

This experiment was conducted to study the energy requirements Yunnan semi-fine wool (YSW) sheep during pregnancy period. Thirty YSW sheep during pregnancy period with similar body weight were randomly divided into 5 groups with 6 replicates per group and 1 sheep per replicate. With different dietary metabolizable energy (ME) levels (pre- and mid-pregnancy period were 7.41, 8.43, 9.06, 9.44 and 10.07 MJ/kg, respectively; late pregnancy period were 7.42, 8.37, 9.02, 9.43 and 9.98 MJ/kg), the energy metabolism regularities and energy requirements were studied by the combination of feeding experiment, digestion and metabolism test and gas exchange test. The results showed that the correlation among ME requirement, metabolic body weight (W^0.75) and average daily gain (ADG) in different pregnancy periods were as follows: pre-pregnancy period, ME (kJ/d)=373.304W^0.75+19.579ADG (R²=0.971); mid-pregnancy period, ME (kJ/d)=385.711W^0.75+20.725ADG (R²=0.952); late pregnancy period, ME (kJ/d)=425.267W^0.75+26.693ADG (R²=0.952). The metabolic energy for maintaining (MEm) requirements gained from the above correlation equations were 373.304, 385.711 and 425.267 kJ/kg W^0.75 for YSW sheep during pre-, mid- and late pregnancy period, respectively. ME required for 100 g daily gain were 1 957.9, 2 072.5, and 2 626.3 kJ for YSW sheep during pre-, mid- and late-pregnancy period, respectively. Heat production (HP) was logarithmicly correlated to ME intake (MEI) according to the logarithmic model: pre-pregnancy period, lg HP=0.000 3MEI+2.449 3 (R²=0.691 8); mid-pregnancy period, lgHP=0.000 2MEI+2.482 2 (R²=0.674 8); late pregnancy period, lgHP=0.000 2MEI+2.530 6 (R²=0.673 0). Thus, the net energy for maintenance (NEm) requirements are 281.38, 303.53 and 339.31 kJ/kg W^0.75 for YSW sheep during pre-, mid- and late-pregnancy periods, respectively. The efficiency of ME used for maintenance (Km) are 0.754, 0.787 and 0.798 for YSW sheep during pre-, mid- and late-pregnancy periods, respectively.

Key words： Yunnan semi-fine wool sheep; pregnancy period; energy metabolism; energy requirement

Cite this article

WU Yuhan , XUE Bai , HONG Qionghua , LI Xiang , WANG Zhisheng , HU Anhai , WANG Lizhi , LU Mingli , PENG Quanhui . Energy Requirements of Yunnan Semi-Fine Wool Sheep during Pregnancy Period[J]. Chinese Journal of Animal Nutrition, 2020 , 32(6) : 2738 -2746 . DOI: 10.3969/j.issn.1006-267x.2020.06.033

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