Effects of Dietary Energy Level on Production Performance and Energy Utilization Efficacy of Lactating Laoshan Dairy Goats

SONG Xiaowen; WANG Huimin; ZHANG Guangfeng; CHENG Ming; DAI Zhenghao; LIN Yingting

doi:10.3969/j.issn.1006-267x.2016.04.018

2016 , Vol. 28 >Issue 4: 1099 - 1104

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.04.018

RUMINANT NUTRITION

Effects of Dietary Energy Level on Production Performance and Energy Utilization Efficacy of Lactating Laoshan Dairy Goats

SONG Xiaowen ,
WANG Huimin ,
ZHANG Guangfeng ,
CHENG Ming ,
DAI Zhenghao ,
LIN Yingting

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1. College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China;
2. Qingdao Institute of Husbandry and Veterinary, Qingdao 266109, China

Received date: 2015-10-22

Online published: 2016-04-11

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Abstract

This experiment was conducted to determine energy requirement of lactating Laoshan dairy goats. Thirty Laoshan dairy goats in lactation with average weight(53.80±1.62) kg, milk yield(1.80±0.19) kg/d, parities(2 times) were used in a single-factor randomized design and equally divided into 3 groups and 10 goats per group(1 goat as 1 replicate). Three groups of the experiment were respectively fed consistent calcium, phosphorus and crude protein levels, but different energy levels(9.7, 10.8 and 11.6 MJ/kg) experimental diets. The feeding trial lasted for 70 d, including a 10-day preliminary trial period at the beginning; and then three goats in each group were selected for a 17-day digestive and metabolism test, also including a 10-day preliminary trial period at the beginning. The result showed as follows, 1) with the improvement of the level of dietary energy, total energy digestibility increased, digestible energy metabolic rate and methane energy in 9.71 MJ/kg group was significantly lower than those in 10.80 and 11.61 MJ/kg groups(P<0.05); and there were no significant differences in total energy, fecal energy and urine energy in three groups(P>0.05); 2) formulas of requirements for digestive energy and metabolizable energy of Laoshan dairy goats were as follows:DE(MJ/d)=0.487W^0.75+0.354ADG+6.120M(P=0.028, R²=0.870); ME(MJ/d)=0.394W^0.75+0.312ADG+5.281M(P=0.031, R²=0.873).(DE was digestive energy, ADG was average daily gain, W^0.75 was the metabolic weight, M was milk yield and ME was the metabolizable energy). Formulas of requirements for digestive energy and metabolizable energy are successfully established in the present study.

Key words： lactating period; Laoshan dairy goat; energy; requirement

Cite this article

SONG Xiaowen , WANG Huimin , ZHANG Guangfeng , CHENG Ming , DAI Zhenghao , LIN Yingting . Effects of Dietary Energy Level on Production Performance and Energy Utilization Efficacy of Lactating Laoshan Dairy Goats[J]. Chinese Journal of Animal Nutrition, 2016 , 28(4) : 1099 -1104 . DOI: 10.3969/j.issn.1006-267x.2016.04.018

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