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| Growth performance and rumen microorganism differ between segregated weaning lambs and grazing lambs |
| JI Shou-kun1, JIANG Cheng-gang1, LI Rui2, DIAO Qi-yu1, TU Yan1, ZHANG Nai-feng1, SI Bing-wen1 |
1 Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
2 Jinfeng Animal Husbandry Group Co., Ltd., Chifeng 024000, P.R.China |
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摘要 Two feeding patterns of the segregated weaning or grazing in the pasture are carried out worldwide in animal production. To investigate the difference of growth performance and rumen microorganism population related to methane metabolism in the two feeding patterns, three groups of lambs (70 in total) were used: Weaning at 21 days old and being subjected to high-concentration diets (3WK group with 20 lambs), weaning at 35 days old and being subjected to high-concentration diets (5WK group with 20 lambs), or grazing at pasture with the nursing mother (Grazing group with 30 lambs). The growth performance, pH value of rumen content, and the rumen microbes were investigated during weaning period and fattening period with approximately 3 months. Our results showed that lambs in 3WK and 5WK groups demonstrated a better growth performance than the lambs in Grazing group, but no significant difference was observed in the pH value between the three groups (P>0.05). The total rumen bacterial population of the Grazing lambs was significantly lower than that of 3WK lambs (P<0.05) and 5WK lambs (P<0.05); however, the population of methanogens was 4.2- and 2.7-fold lower in the 3wk (P<0.05) and 5wk (P<0.05) lambs compared with Grazing lambs, respectively; protozoa were also 3.5- and 3.4-fold lower in the 3WK (P<0.05) and 5WK (P<0.05) lambs, respectively. The results revealed that segregated weaning lambs may have better growth performance, and reduce methane-producing microbes.
Abstract Two feeding patterns of the segregated weaning or grazing in the pasture are carried out worldwide in animal production. To investigate the difference of growth performance and rumen microorganism population related to methane metabolism in the two feeding patterns, three groups of lambs (70 in total) were used: Weaning at 21 days old and being subjected to high-concentration diets (3WK group with 20 lambs), weaning at 35 days old and being subjected to high-concentration diets (5WK group with 20 lambs), or grazing at pasture with the nursing mother (Grazing group with 30 lambs). The growth performance, pH value of rumen content, and the rumen microbes were investigated during weaning period and fattening period with approximately 3 months. Our results showed that lambs in 3WK and 5WK groups demonstrated a better growth performance than the lambs in Grazing group, but no significant difference was observed in the pH value between the three groups (P>0.05). The total rumen bacterial population of the Grazing lambs was significantly lower than that of 3WK lambs (P<0.05) and 5WK lambs (P<0.05); however, the population of methanogens was 4.2- and 2.7-fold lower in the 3wk (P<0.05) and 5wk (P<0.05) lambs compared with Grazing lambs, respectively; protozoa were also 3.5- and 3.4-fold lower in the 3WK (P<0.05) and 5WK (P<0.05) lambs, respectively. The results revealed that segregated weaning lambs may have better growth performance, and reduce methane-producing microbes.
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Received: 31 March 2015
Accepted:
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| Fund: The project was supported by the Earmarked Fund for the Modern Agro-Industry Technology Research System, China (CARS-39, 200903006), and the Special Fund for Agro-Scientific Research in the Public Interest, China (201303062). |
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Corresponding Authors:
DIAO Qi-yu, Tel: +86-10-82106055, Fax: +86-10-62169105, E-mail: diaoqiyu@caas.cn
E-mail: diaoqiyu@caas.cn
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| About author: JI Shou-kun, E-mail: jishoukun@163.com |
Cite this article:
JI Shou-kun, JIANG Cheng-gang, LI Rui, DIAO Qi-yu, TU Yan, ZHANG Nai-feng, SI Bing-wen.
2016.
Growth performance and rumen microorganism differ between segregated weaning lambs and grazing lambs. Journal of Integrative Agriculture, 15(4): 872-878.
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