空怀期云南半细毛羊钙需要量研究

doi:10.16431/j.cnki.1671-7236.2020.12.017

Abstract

Abstract: The study was conducted to investigate the effects of different dietary calcium levels on nutrient digestion and metabolism of Yunnan semi-fine wool sheep during the empty pregnant period,and to provide basis for formulating the standard of calcium requirement of Yunnan semi-fine wool sheep.Fifty Yunnan semi-fine wool sheep with healthy body condition,close body weight and 2 births were randomly allocated to 5 groups,which were groupsⅠ (0.44% calcium),Ⅱ (0.67% calcium),Ⅲ (0.82% calcium),Ⅳ (1.00% calcium) and Ⅴ (1.13% calcium).The experiment was divided into pre-trial period (14 days) and formal period (30 days).On the 7th day of the formal period,five sheep were randomly selected from each experimental group and placed in separate metabolic cages for digestive and metabolic tests.The experimental results showed that:With the increase of dietary calcium content,the dry matter intake of Yunnan semi-fine wool sheep in empty pregnant period decreased at first and then increasing (P>0.05).The higher the dietary calcium level of Yunnan semi-fine wool sheep in empty pregnant period,the greater the excretion of fecal calcium (P<0.05),and the greater the excretion of calcium (P<0.05).Regression analysis showed that the calcium maintenance requirement of Yunnan semi-fine wool sheep in empty pregnant period was 7.93 g/d and R²=0.5827 according to the linear relationship between different calcium levels of diets and average daily gain.Linear regression analysis between calcium intake and deposited calcium showed that the maximum deposited calcium of Yunnan semi-fine wool sheep during empty pregnant period was 3.64 g/d.In conclusion,the increase of dietary calcium level of Yunnan semi-fine wool sheep during empty pregnant period had a certain effect on dry matter intake,but had no significant effect on the apparent digestibility of each nutrient.Fecal calcium and excreted calcium of Yunnan semi-fine wool sheep in empty pregnant period increased with the increase of dietary calcium level.Under different dietary calcium levels,the calcium intake level had little correlation with the daily gain of Yunnan semi-fine wool sheep in empty pregnant period.

Key words: Yunnan semi-fine wool sheep; dry matter intake; nutrient metabolic rate; calcium requirement

CLC Number:

S816.1

LIANG Jiachong, OUYANG Yina, LI Yinjiang, LI Weijuan, WANG Siyu, XUE Bai, HONG Qionghua. Study on Calcium Requirement of Non-Pregnan Yunnan Semi-fine Wool Sheep[J]. China Animal Husbandry and Veterinary Medicine, 2020, 47(12): 3944-3952.

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Study on Calcium Requirement of Non-Pregnan Yunnan Semi-fine Wool Sheep

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