Effects of Energy Level on Growth Performance and Nutrient Digestion and Metabolism of Shanbei White Cashmere Goats during Growth Period

HUANG Shuai; ZHU Haijing; SHI Lei; BI Taifei; GAO Ye; LU Yuanyuan; CHEN Shaodong; QU Lei

doi:10.3969/j.issn.1006-267x.2015.12.035

2015 , Vol. 27 >Issue 12: 3931 - 3939

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.12.035

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Effects of Energy Level on Growth Performance and Nutrient Digestion and Metabolism of Shanbei White Cashmere Goats during Growth Period

HUANG Shuai ,
ZHU Haijing ,
SHI Lei ,
BI Taifei ,
GAO Ye ,
LU Yuanyuan ,
CHEN Shaodong ,
QU Lei

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Shaanxi Province Research Center of Shanbei Cashmere Goat of Engineering & Technology, Yulin University, Yulin 719000, China

Received date: 2015-06-25

Online published: 2015-12-14

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Abstract

This experiment was conducted to study the optimal energy level of Shanbei white cashmere goats during growth period. Thirty two(half male and half female) healthy 5-month-old goats with similar body weight were selected and divided into 4 groups(Ⅰ, Ⅱ, Ⅲ and Ⅳ) by a single-factor random block design. The crude protein(CP) level was 11.16%, and groups Ⅰ, Ⅱ, Ⅲ and Ⅳ were fed four diets differed in digestive energy(DE)(9.33, 10.49, 11.66 and 12.61 MJ/kg, respectively). The feeding experiment lasted for 60 days, and then digestive and metabolic experiments were conducted for 14 days. The results showed as follows:1) group Ⅲ of ewes had the greatest actual DE intake level(P>0.05), the actual DE intake level of rams and the actual CP intake level of ewes in group Ⅲ were the greatest among four groups(P<0.05), and the actual CP intake level of rams in group Ⅲ was significantly higher than that in group Ⅳ(P<0.05). 2) Group Ⅲ of goats had the greatest dry matter intake(DMI); dietary energy level had no significant influence on average daily gain(ADG) and feed to gain ratio(F/G)(P>0.05). 3) Gain benefit in group Ⅲ was the greatest among four groups, nevertheless, the gross returns in group Ⅰ was the greatest among four groups, followed by group Ⅲ. 4) Apparent digestibility of CP of ewes in group Ⅳ was significantly higher than that in group Ⅰ(P<0.05), and no significant difference was observed for apparent digestibility of dry matter among four groups(P>0.05); apparent digestibility of CP of rams in group Ⅲ was significantly higher than that in group Ⅰ(P<0.05), and that of DM of rams in group Ⅲ and Ⅳ was significantly higher than that in group Ⅰ(P<0.05). 5) The gross energy(GE) and DE intakes in group Ⅲ was the greatest among four groups, and fecal energy in group Ⅳ was the lowest; energy digestibility of rams in groups Ⅲ, Ⅳ was significantly higher than that in groups Ⅰ and Ⅱ(P<0.05), however, no significant difference was observed for the energy digestibility of ewes among four groups(P>0.05). 6) Blood contents of nonesterified fatty acid(NEFA) and β-hydroxybutyrate acid of goats in group Ⅳ were the lowest among four groups; blood contents of glucose and total protein in group Ⅲ were the greatest, while the urinary nitrogen content was the lowest. In summary, the optimal energy level of Shanbei white cashmere goats aged 5 to 6 months is above 11.63 MJ/kg.

Key words： Shanbei white cashmere goats; energy level; growth performance; nutrient digestion and metabolism; blood parameters

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HUANG Shuai , ZHU Haijing , SHI Lei , BI Taifei , GAO Ye , LU Yuanyuan , CHEN Shaodong , QU Lei . Effects of Energy Level on Growth Performance and Nutrient Digestion and Metabolism of Shanbei White Cashmere Goats during Growth Period[J]. Chinese Journal of Animal Nutrition, 2015 , 27(12) : 3931 -3939 . DOI: 10.3969/j.issn.1006-267x.2015.12.035

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