Calcium Requirement of Yunnan Semi-Fine Wool Sheep in Early and Mid-Pregnancy

LI Weijuan; LI Yinjiang; XUE Bai; MA Xingyue; WANG Siyu; OUYANG Yina; LIANG Jiachong; HONG Qionghua

doi:10.3969/j.issn.1006-267x.2021.06.031

Chinese Journal of Animal Nutrition >

2021 , Vol. 33 >Issue 6: 3289 - 3296

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.06.031

RUMINANT AND HERBIVORE NUTRITION AND FEED

Calcium Requirement of Yunnan Semi-Fine Wool Sheep in Early and Mid-Pregnancy

LI Weijuan ,
LI Yinjiang ,
XUE Bai ,
MA Xingyue ,
WANG Siyu ,
OUYANG Yina ,
LIANG Jiachong ,
HONG Qionghua

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

Received date: 2020-12-02

Online published: 2021-06-10

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Abstract

This experiment was conducted to determine the calcium requirement of Yunnan semi-fine wool sheep in early and mid-pregnancy. Fifty multiparous Yunan semi-fine wool sheep with good body condition, similar age and breeding date, body weight of (45.14±3.94) kg, were selected and randomly allocated into 5 groups (10 sheep per group), and were fed experimental diets with the calcium level of 0.42%, 0.45%, 0.56%, 0.65% and 0.82%, respectively. The experiment began on the 46th day of pregnancy and lasted for 74 days, with 14-day preliminary period and 60-day formal period. In early (the 70th to 75th day of pregnancy) and mid-pregnancy (the 100th to 105th day of pregnancy), five sheep were selected from each group for a 5-d digestion and metabolism trial. The results showed as follows:1) dietary calcium level did not significantly affect the dry matter intake, total weight gain, average daily gain and feed/gain (P>0.05). 2) With the dietary calcium level increasing, the calcium intake and calcium excretion of Yunnan semi-fine wool sheep in early and mid-pregnancy were significantly increased (P<0.05). The apparent digestibility of calcium in early pregnancy showed that 0.82% group was significantly higher than 0.45% and 0.56% groups (P<0.05), and it in mid-pregnancy showed that 0.82% group was significantly higher than 0.42%, 0.45% and 0.56% groups (P<0.05), and 0.65% group was significantly higher than 0.42% and 0.45%groups (P<0.05). In early pregnancy, the calcium deposition in 0.82% was significantly higher than that in other groups (P<0.05), and it in 0.65% group was significantly higher than that in 0.42%, 0.45% and 0.56% groups (P<0.05); the calcium deposition rate in 0.82% group was significantly higher than that in 0.45% and 0.56% groups (P<0.05). In mid-pregnancy, the calcium deposition in 0.82% was significantly higher than that in other groups (P<0.05), and it in 0.65% group was significantly higher than that in 0.42% and 0.45% groups (P<0.05); the calcium deposition rate in 0.82% was significantly higher than that in other groups (P<0.05), and it in 0.65% group was significantly higher than that in 0.42% and 0.45% groups (P<0.05). In conclusion, under the condition of this experiment, dietary calcium level do not affect the growth performance, but significantly affects the intake, excretion, deposition, apparent digestibility and deposition rate of calcium of Yunnan semi-fine wool sheep in early and mid-pregnancy. The maintenance calcium requirement of Yunnan semi-fine wool sheep in early and mid-pregnancy is 0.108 7 and 0.131 0 g/(kg W^0.75·d), and the total calcium requirement is 0.490 and 0.508 g/(kg W^0.75·d), respectively.

Key words： pregnancy; Yunnan semi-fine wool sheep; growth performance; calcium; requirement

Cite this article

LI Weijuan , LI Yinjiang , XUE Bai , MA Xingyue , WANG Siyu , OUYANG Yina , LIANG Jiachong , HONG Qionghua . Calcium Requirement of Yunnan Semi-Fine Wool Sheep in Early and Mid-Pregnancy[J]. Chinese Journal of Animal Nutrition, 2021 , 33(6) : 3289 -3296 . DOI: 10.3969/j.issn.1006-267x.2021.06.031

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