Effects Supplementation of Concentrates with Different Ratios of Energy to Nitrogen on Nutrient Digestion and Rumen Fermentation in Lambs in Pastoral Areas in Winter and Spring

YANG Chuntao, SI Bingwen, Siqinbateer, Sarenhua, Sudebilige, JIN Hai, CUI Xiang, ZENG Shuqin, DIAO Qiyu, TU Yan

doi:10.3969/j.issn.1006-267x.2014.09.025

2014 , Vol. 26 >Issue 9: 2637 - 2644

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.09.025

Ruminants and Herbivorous Animal Nutrition

Effects Supplementation of Concentrates with Different Ratios of Energy to Nitrogen on Nutrient Digestion and Rumen Fermentation in Lambs in Pastoral Areas in Winter and Spring

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1. Feed Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Feed Biotechnology, Ministry of Agriculture, Beijing 100081, China;
2. Animal Husbandry Station, Xianghuangqi County, Xilinguole, Inner Mongolia, Xilinguole 013250, China;
3. Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Huhhot 010031, China

Received date: 2014-04-14

Online published: 2014-09-10

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Abstract

This study was aimed to investigate the effects of supplementation of concentrates with different ratios of energy to nitrogen on nutrient digestion and rumen fermentation of weaner lambs in pastoral areas that only had low quality roughages in winter and spring. One hundred and twenty eight healthy weaner lambs aged (61±2) days with body weight of (20.56±1.43) kg were assigned to four groups with 32 lambs (half male and half female) in each group. Lambs in four groups were supplemented with concentrates with similar digestive energy (DE) level and gradually increased crude protein (CP) content, and the ratio of energy to nitrogen (calculated by DE/CP) was 90.03 (group Ⅰ), 82.55 (group Ⅱ), 73.25 (group Ⅲ) and 67.87 MJ/kg (group Ⅳ), respectively. The experiment lasted for 40 days. The results showed as follows: 1) dry matter intake was not significantly changed by the supplementation of concentrates with different ratios of energy to nitrogen (P>0.05); CP apparent digestibility of group Ⅲ was 17.26% and 23.84% higher than that of group Ⅰ and group Ⅱ, respectively (P<0.05); neutral detergent fiber (NDF) apparent digestibility tended to be increased at first but then declined (0.05≤P<0.10), and that of group Ⅲ (63.13%) was the highest; calcium (Ca) apparent digestibility of group Ⅲ was 8.52% and 4.13% higher than that of group Ⅰ and group Ⅱ, respectively (P<0.05). 2) Although rumen fluid pH was not significantly different among groups (P>0.05), ammonia nitrogen (NH₃-H) concentration of rumen fluid of group Ⅳ was significantly higher than that of the other groups (P<0.05). 3) The supplementation of concentrates with different ratios of energy to nitrogen had significant impacts on total volatile fatty acids (TVFA) concentration, and propionate and butyrate contents (P<0.05), and tended to affect acetate content and the ratio of acetate to propionate (0.05≤P<0.10). Acetate content and the ratio of acetate to propionate of group Ⅰ were lower than those of the other groups (P>0.05); propionate content of group Ⅰ was significantly higher than that of the other groups (P<0.05); TVFA concentration of group Ⅲ was 29.11% (P<0.05), 30.32% (P<0.05) and 11.93% (P>0.05) lower than that in group Ⅰ, group Ⅱ and group Ⅳ, respectively. In conclusion, nutrient apparent digestibility in lambs supplemented with concentrates with different ratios of energy to nitrogen is significantly different in pastoral area that only has low quality roughages in winter and spring. When the ratio of energy to nitrogen is 73.25 MJ/kg, the apparent digestibility of CP, NDF and Ca achieve the maximum value, and the condition of the above ratio of energy to nitrogen is contribute to improve rumen fermentation model.

Key words： lamb; supplementation; lamb feed; the ratio of energy to nitrogen; nutrient apparent digestibility; rumen fermentation model

Cite this article

YANG Chuntao, SI Bingwen, Siqinbateer, Sarenhua, Sudebilige, JIN Hai, CUI Xiang, ZENG Shuqin, DIAO Qiyu, TU Yan . Effects Supplementation of Concentrates with Different Ratios of Energy to Nitrogen on Nutrient Digestion and Rumen Fermentation in Lambs in Pastoral Areas in Winter and Spring[J]. Chinese Journal of Animal Nutrition, 2014 , 26(9) : 2637 -2644 . DOI: 10.3969/j.issn.1006-267x.2014.09.025

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