Feed Science and Technology

Effects of Urea Phosphate on Calcium and Phosphorus Contents in Serum and Muscle and Related Hormone Contents in Serum of Lambs

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  • 1. Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    2. Station of Animal and Veterinary of the Ministry of Agriculture, Beijing 100026, China

Received date: 2014-10-29

  Online published: 2015-03-18

Abstract

This experiment was conducted to study the effects of different levels of urea phosphate supplementation on calcium (Ca) and phosphorus (P) contents in serum and muscle and related hormone contents in serum of lambs. Eighty Dorper×thin-tailed Han F1 crossbred lambs were randomly divided into 5 groups with 8 replicates per group and 2 lambs per replicate. Soybean meal and some other protein feeds were replaced by 0, 1.0%, 4.0% and 8.0% of urea phosphate in concentrate, respectively. During the 12-day adaptation period, the ratio of concentrate to roughage was 1:1, and lambs were fed ad libitum; during the 60-day experimental period, the intake of ratio of concentrate to roughage was 1:1, and the actually intake of urea phosphate levels were 0 (control group), 0.5% (0.5% group), 1.0% (1.0% group), 2.0% (2.0% group) and 4.0% (4.0% group), respectively. On 1 (the starting day of adaptation period), 13 and 73 days, blood samples were collected from 8 lambs of each group before morning feeding to determine the contents of Ca, P (1, 13 and 73 d) parathyroid hormone (PTH), calcitonin (CT) and 25-hydroxy vitamin D (25-OH-VD) (1 and 13 d). On 73 days, six lambs of each group were slaughtered and the longissimus dorsi was sampled to analyze the contents of Ca and P. The results showed as follows: 1) in serum, Ca content decreased and P content increased with the increasing level of urea phosphate. Serum Ca content showed no significant difference on 1 and 73 days among groups (P>0.05), while that of 4.0% group was significantly lower than that of the other groups on 13 days (P<0.05). No significant difference was found in serum P content on 1 day (P>0.05). Serum P content of 4.0% group was significantly higher than that of control, 1.0%, and 2.0% groups on 13 days (P<0.05). On 73 days, serum P content of 4.0% group was significantly higher than that of control and 0.5% groups (P<0.05), and control group was significantly lower than that of 1.0%, 2.0%, and 4.0% groups (P<0.05). 2) There were no significant differences of Ca and P contents in longissimus dorsi among groups (P>0.05). 3) The differences among the contents of PTH and 25-OH-VD in serum were not significant (P>0.05). The content of CT in 1.0% and 2.0% groups was significantly lower than that of control and 4.0% groups on 13 days (P<0.05). In conclusion, Ca content decreases while P content increases in serum and muscle with the supplementation of urea phosphate. Serum of PTH and 25-OH-VD contents are not affected by urea phosphate. The supplementation of urea phosphate can significantly change serum CT content. The supplementation of 4.0% of urea phosphate inhibits the increase in weight of lambs.

Cite this article

ZHANG Fan, JI Shoukun, ZHANG Naifeng, JIANG Chenggang, WANG Liwen, DING Jian, SI Bingwen, TU Yan, DIAO Qiyu . Effects of Urea Phosphate on Calcium and Phosphorus Contents in Serum and Muscle and Related Hormone Contents in Serum of Lambs[J]. Chinese Journal of Animal Nutrition, 2015 , 27(3) : 845 -852 . DOI: 10.3969/j.issn.1006-267x.2015.03.023

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