Phosphorus Requirement for Yunnan Semi-Fine Wool Sheep during Non-Pregnancy

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

doi:10.3969/j.issn.1006-267x.2021.11.022

Chinese Journal of Animal Nutrition >

2021 , Vol. 33 >Issue 11: 6213 - 6222

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.11.022

RUMINANT AND HERBIVORE NUTRITION AND FEED

Phosphorus Requirement for Yunnan Semi-Fine Wool Sheep during Non-Pregnancy

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

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

Received date: 2021-04-17

Online published: 2021-11-10

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Abstract

This study was conducted to evaluate the effects of dietary phosphorus (P) level on growth performance, P digestion and metabolism, and serum biochemical indices of Yunnan semi-fine wool sheep during non-pregnancy, and to determine the P requirement for Yunnan semi-fine wool sheep during non-pregnancy. A total of fifty healthy non-pregnant Yunnan semi-fine wool sheep with the similar age and body weight were randomly divided into 5 groups, and each group had 10 replicates containing 1 ewe per replicate. The P level of experiment diets for the 5 groups were 0.19%, 0.32%, 0.45%, 0.56% and 0.64%, respectively, and other nutrient levels were consistent. The experiment lasted for 44 d, including 14 d of pretrial period and 30 d of experimental period. On the 12th day of the experimental period, five ewes were randomly selected from each group and fed individually in cage for digestion and metabolism experiment of 5 d. The results showed as follows:1) the average net gain and average daily gain in 0.19% and 0.32% P level groups were significantly higher than those in 0.45% and 0.64% P level groups (P<0.05), however, the feed/gain in 0.19% and 0.32% P level groups was significantly lower than that in 0.45% and 0.64% P level groups (P<0.05). The highest dry matter intake was observed in 0.19% P level group, which was significantly higher than that in 0.45%, 0.56% and 0.64% P level groups (P<0.05), but there was no significant different between 0.19% and 0.32% P level groups (P>0.05). 2) P intake, fecal P, urine P, P excretion, digestible P and P retention were significantly or extremely significantly increased with the dietary P level increasing (P<0.05). P apparent digestibility and P utilization were decreased firstly and then increased with the dietary P level increasing. No significant differences were found in P utilization among 0.19%, 0.56% and 0.64% P level groups (P>0.05). 3) Serum P content and alkaline phosphatase (ALP) activities were increased with the dietary P level increasing. Serum calcitonin (CT) and leptin (LEP) contents were increased firstly and then decreased with the dietary P level increasing. Serum hydroxyproline (HYP) content in 0.32% P level group was significantly higher than that in 0.45% and 0.56% P level groups (P<0.05). Dietary P level had no significant effects on serum calcium (Ca), parathyroid hormone (PTH) and osteocalcin (BGP) contents (P>0.05). 4) The correlation between P intake (x) and P retention (y₃) was showed in the linear regression equation, y₃=0.309 1x-0.025 4 (R²=0.893 4). According to above findings, when the dietary P level is 0.19% to 0.32%, it is beneficial to maintain the growth and decrease the excretion and deposition of P. Maintenance P requirement of Yunnan semi-fine wool sheep during non-pregnancy is 0.082 2 g/(kg W^0.75·d), and the total P requirement is 0.21 to 0.33 g/(kg W^0.75·d).

Key words： Yunnan semi-fine wool sheep; non-pregnancy; phosphorus; growth performance; phosphorus digestion and metabolism; serum biochemical indexes; phosphorus requirement

Cite this article

OUYANG Yina , WANG Siyu , LIANG Jiachong , XUE Bai , LI Weijuan , LI Yinjiang , HONG Qionghua . Phosphorus Requirement for Yunnan Semi-Fine Wool Sheep during Non-Pregnancy[J]. Chinese Journal of Animal Nutrition, 2021 , 33(11) : 6213 -6222 . DOI: 10.3969/j.issn.1006-267x.2021.11.022

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