Effects of Dietary Phosphorus Level on Nutrient Excretions and Nitrogen Balance of Yunnan Semi-Fine Wool Sheep during Non-Pregnancy Period

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

doi:10.3969/j.issn.1006-267x.2020.10.043

2020 , Vol. 32 >Issue 10: 4922 - 4930

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.10.043

Effects of Dietary Phosphorus Level on Nutrient Excretions and Nitrogen Balance of Yunnan Semi-Fine Wool Sheep during Non-Pregnancy Period

OUYANG Yina ,
XUE Bai ,
WANG Siyu ,
LIANG Jiachong ,
LI Yinjiang ,
LI Weijuan ,
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: 2020-04-22

Online published: 2020-10-22

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Abstract

The current study was conducted to evaluate the effects of dietary phosphorus (P) level on excretions of nitrogen (N), calcium (Ca) and phosphorus (P) and N balance of non-pregnant Yunnan semi-fine wool sheep during non-pregnant period. Fifty healthy non-pregnant multiparous Yunnan semi-fine wool sheep at the age of 30 months and with the body weight of (46.36±2.77) kg were randomly divided into 5 groups with 10 replicates per group and 1 ewe per replicate. The P levels of diets for 5 groups were 0.19%, 0.32%, 0.45%, 0.56% and 0.64%, respectively, and other nutrient levels in the diets were essentially consistent. The experiment lasted for 44 d. There was a pretrial period of 14 d followed by an experimental period of 30 d. On the 9th day of the experimental period, five ewes were randomly selected from each group for digestion and metabolism experiment with a 3-d pretrial period by a 5-d trial period (the 12th to 16th day). The results showed as follows: 1) dietary P level had no significant effects on the excretions of total N and urine N (P>0.05). Fecal N excretion in 0.45% P level group was significantly higher than that in 0.32% P level group (P<0.05); however, there was no significant difference compared with 0.19%, 0.56% and 0.64% P level groups (P>0.05). 2) Excretions of total P and fecal P were significantly increased with the dietary P level increasing (P<0.01). Urine P excretion was the highest in 0.64% P level group and the lowest in 0.19% P level group (P<0.01), while there was no significantly difference among 0.32%, 0.45% and 0.56% P level groups (P>0.05). 3) Excretions of total Ca and fecal Ca were the highest in 0.19% P level group, which was significantly higher than those in 0.45%, 0.56% and 0.64% P level groups (P<0.05). The lowest excretions of total Ca and fecal Ca were observed in 0.64% P level group, which was significantly lower than those in other groups (P<0.01). Similarly, urine Ca excretion was the highest in 0.32% P level group, which was significantly higher than that in 0.19%, 0.56% and 0.64% P level groups (P<0.05); however, the lowest urine Ca excretion was found in 0.56% P level group, which was significantly lower than that in other groups (P<0.05). 4) Dry matter intake (DMI) in 0.19%, 0.32% and 0.45% P level groups was significantly higher than that in 0.56% and 0.64% P level groups (P<0.05). N intake and N retention in 0.19% P level group were significantly higher than those in other groups (P<0.01), and the N intake in 0.32% and 0.45% P level groups was significantly higher than that in 0.56% and 0.64% P level groups (P<0.05). There was no significant difference in the N retention among 0.32%, 0.45%, 0.56% and 0.64% P level groups (P>0.05). The highest N retention rate was observed in 0.19% P group, which was significantly than that in 0.45%, 0.56% and 0.64% P level groups (P<0.05); however, there was no significant difference between 0.19% and 0.32% P level groups (P>0.05). Nitrogen balance in the 5 groups was positive. According to above findings, when the dietary P level is 0.19% to 0.32%, it is beneficial to enhance the N retention and N retention rate of Yunnan semi-fine wool ewes during non-pregnancy period, decrease the excretions of N and P, and reduce environmental pollution.

Key words： phosphorus; Yunnan semi-fine wool sheep; non-pregnancy period; nutrient excretions; nitrogen balance

Cite this article

OUYANG Yina , XUE Bai , WANG Siyu , LIANG Jiachong , LI Yinjiang , LI Weijuan , HONG Qionghua . Effects of Dietary Phosphorus Level on Nutrient Excretions and Nitrogen Balance of Yunnan Semi-Fine Wool Sheep during Non-Pregnancy Period[J]. Chinese Journal of Animal Nutrition, 2020 , 32(10) : 4922 -4930 . DOI: 10.3969/j.issn.1006-267x.2020.10.043

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