Effects of Dietary Phosphorus Content on Growth Performance, Blood Indicators and Phosphorus Excretion of Heifers Aged 11 to 15 Months

SUN Guoqiang; WANG Shuzhi; LYU Yongyan; WANG Ling; WU Dandan

doi:10.3969/j.issn.1006-267x.2015.12.033

2015 , Vol. 27 >Issue 12: 3912 - 3919

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.12.033

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Effects of Dietary Phosphorus Content on Growth Performance, Blood Indicators and Phosphorus Excretion of Heifers Aged 11 to 15 Months

SUN Guoqiang ,
WANG Shuzhi ,
LYU Yongyan ,
WANG Ling ,
WU Dandan

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1. College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China;
2. Weihai Jiasheng Dairy Co., Ltd., Rongcheng 264300, China

Received date: 2015-07-08

Online published: 2015-12-14

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Abstract

This experiment was conducted to investigate the effects of dietary phosphorus content on growth performance, blood indicators and phosphorus excretion of heifers. Thirty health heifers of Holstein cows with similar body weight and age[(11.1±0.3) months of age] were randomly assigned to 5 groups with 6 cows in each group. The dietary phosphorus content was 0.36%(control), 0.33%, 0.30% 0.28% and 0.25%, respectively. The pretest lasted for 15 days, and the test lasted for 90 days. The results showed as follows:1) there was no significant difference in initial weight, final weight, average daily gain, dry matter intake and feed to gain ratio among groups(P>0.05); 2) with reducing of dietary phosphorus content, the apparent digestibility of phosphorus was significantly increased(P<0.05 or P<0.01), and there were no significant effects on the apparent digestibility of dry matter, crude protein, neutral detergent fiber and acid detergent fiber(P>0.05); 3) there were no significant differences on serum parathyroid element, vitamin D₃, calcium and phosphorus contents, and alkaline phosphatase activity(P>0.05); 4) compared with control group, phosphorus intake, feces phosphorus, urine phosphorus and total phosphorus excretion were significantly decreased when dietary phosphorus content reduced to 0.30%, 0.28% and 0.25%(P<0.01), total phosphorus excretion was reduced by 7.02%, 21.42%, 35.17%, 45.49% when dietary phosphorus content was 0.33%, 0.30%, 0.28% and 0.25%, respectively. The results indicate that dietary phosphorus content reduced to 0.25%(without addition of feed containing phosphorus) does not affect growth performance, blood indicators and nutrient apparent digestibility of heifers, but can increase apparent digestibility of phosphorus, and reduce phosphorus excretion.

Key words： calcium hydrogen phosphorus; heifers; growth performance; blood indicators; phosphorus excretion

Cite this article

SUN Guoqiang , WANG Shuzhi , LYU Yongyan , WANG Ling , WU Dandan . Effects of Dietary Phosphorus Content on Growth Performance, Blood Indicators and Phosphorus Excretion of Heifers Aged 11 to 15 Months[J]. Chinese Journal of Animal Nutrition, 2015 , 27(12) : 3912 -3919 . DOI: 10.3969/j.issn.1006-267x.2015.12.033

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