Molecular Nutrition

Effects of Different Dietary Compositions on Performance, Blood Biochemical Parameters, Nitrogen and Phosphorus Emissions of Lactating Holstein Cows

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  • College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China

Received date: 2017-11-29

  Online published: 2018-06-20

Abstract

In order to control emissions of nitrogen and phosphorus in feces and urine of dairy cows without effects on performance, this study investigate the effects of reduction of dietary nitrogen and phosphorus or using compound additives on production performance, blood biochemical parameters, and nitrogen and phosphorus emissions of lactating Holstein cows. Thirty-six lactating Holstein cows were randomly selected and divided into 3 groups with 12 cows per group. Cows in control (CR) group were fed the original diet in farm, those in low protein and phosphorus group (LPP) group were fed an experimental diet which had 0.70% and 0.03% lower protein and phosphorus than the original diet in farm, and those in compound additive group (CA) group were fed the original diet in farm and compound additives (composed of active yeast, enzyme preparation and organic zinc). The pre-test lasted for 7 d, and the formal test lasted for 30 d. The results showed as follows:there were no significant differences of milk yield, dry matter intake and milk composition (P>0.05); compared with CR group, apparent digestibility of acid detergent fiber and phosphorus were increased by 73.12% and 42.94%(P<0.05), respectively; compared with CR group, emissions of total nitrogen and total phosphorus in LPP group were decreased by 9.11% and 26.34% (P<0.05), respectively, and those in CA group were decreased by 16.35% and 16.10% (P<0.05), respectively; blood aspartate aminotransferase (ALT) activity and phosphorus content in CA group were significantly higher than those in CR group (P<0.05), while blood biochemical parameters in CR group and LPP group were not significantly different (P>0.05). Under the condition of normal nutritional requirements are satisfied, appropriately controlling nitrogen and phosphorus intakes of cows, or using the compound additives can reduce the emission of nitrogen and phosphorus.

Cite this article

ZHAO Ruohan, LI Lian, HAN Zhaoyu, YANG Fangxiao, WANG Genlin . Effects of Different Dietary Compositions on Performance, Blood Biochemical Parameters, Nitrogen and Phosphorus Emissions of Lactating Holstein Cows[J]. Chinese Journal of Animal Nutrition, 2018 , 30(6) : 2155 -2163 . DOI: 10.3969/j.issn.1006-267x.2018.06.018

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