Protein requirements of early-weaned Dorper crossbred female lambs
The net protein (NP) and metabolizable protein (MP) requirements of Dorper crossbred female lambs from 20 to 35 kg body weight (BW) were assessed in a comparative slaughter trial. Thirty-five Dorper×thin-tailed Han crossbred lambs weaned at approximately 50 d of age ((19.1±2.37) kg of BW) were used....
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KeAi Communications Co., Ltd.
2017-05-01
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| Series: | Journal of Integrative Agriculture |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095311916614557 |
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| author | Tao MA Kai-dong DENG Yan TU Nai-feng ZHANG Bing-wen SI Gui-shan XU Qi-yu DIAO |
| author_facet | Tao MA Kai-dong DENG Yan TU Nai-feng ZHANG Bing-wen SI Gui-shan XU Qi-yu DIAO |
| author_sort | Tao MA |
| collection | DOAJ |
| description | The net protein (NP) and metabolizable protein (MP) requirements of Dorper crossbred female lambs from 20 to 35 kg body weight (BW) were assessed in a comparative slaughter trial. Thirty-five Dorper×thin-tailed Han crossbred lambs weaned at approximately 50 d of age ((19.1±2.37) kg of BW) were used. Seven randomly selected lambs were slaughtered at the beginning of the trial as baseline group (BL). An intermediate group of seven randomly selected lambs fed ad libitum (AL) intake was slaughtered when the lambs reached an average BW of 28.6 kg. The remaining 21 lambs were allotted randomly to three levels of dry matter intake: AL or restricted to 70 or 40% of the AL intake. All lambs were slaughtered when the sheep fed AL intake reached 35 kg of BW. Total body N and N retention were determined. The results showed that the maintenance requirements for NP and MP were 1.75 and 3.37 g kg−1 metabolic shrunk body weight (SBW0.75), respectively. The partial efficiency of protein use for maintenance was 0.52. The NP requirements for growth ranged from 10.9 to 42.4 g d−1 for the lambs gaining 100 to 350 g d−1 from 20 to 35 kg BW. The partial efficiency of MP for growth was 0.52. In conclusion, the NP and MP requirements for the maintenance and growth of Dorper crossbred female lambs were lower than those reported by AFRC (1993) and NRC (2007) recommendations. |
| format | Article |
| id | doaj-art-a8e5baaf4f4a4ef5ae6ee3477764d31f |
| institution | Kabale University |
| issn | 2095-3119 |
| language | English |
| publishDate | 2017-05-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Integrative Agriculture |
| spelling | doaj-art-a8e5baaf4f4a4ef5ae6ee3477764d31f2025-08-20T03:56:59ZengKeAi Communications Co., Ltd.Journal of Integrative Agriculture2095-31192017-05-011651138114410.1016/S2095-3119(16)61455-7Protein requirements of early-weaned Dorper crossbred female lambsTao MA0Kai-dong DENG1Yan TU2Nai-feng ZHANG3Bing-wen SI4Gui-shan XU5Qi-yu DIAO6Feed Research Institute/Key Laboratory of Feed Biotechnology, Ministry of Agriculture/Chinese Academy of Agricultural Sciences, Beijing 100081, P.R. ChinaCollege of Animal Science, Jinling Institute of Technology, Nanjing 211100, P.R. ChinaFeed Research Institute/Key Laboratory of Feed Biotechnology, Ministry of Agriculture/Chinese Academy of Agricultural Sciences, Beijing 100081, P.R. ChinaFeed Research Institute/Key Laboratory of Feed Biotechnology, Ministry of Agriculture/Chinese Academy of Agricultural Sciences, Beijing 100081, P.R. ChinaFeed Research Institute/Key Laboratory of Feed Biotechnology, Ministry of Agriculture/Chinese Academy of Agricultural Sciences, Beijing 100081, P.R. ChinaCollege of Animal Science, Tarim University, Alar 843300, P.R. ChinaFeed Research Institute/Key Laboratory of Feed Biotechnology, Ministry of Agriculture/Chinese Academy of Agricultural Sciences, Beijing 100081, P.R. China; Correspondence DIAO Qi-yu, Tel: +86-10-82106055, Fax: +86-10-62169105The net protein (NP) and metabolizable protein (MP) requirements of Dorper crossbred female lambs from 20 to 35 kg body weight (BW) were assessed in a comparative slaughter trial. Thirty-five Dorper×thin-tailed Han crossbred lambs weaned at approximately 50 d of age ((19.1±2.37) kg of BW) were used. Seven randomly selected lambs were slaughtered at the beginning of the trial as baseline group (BL). An intermediate group of seven randomly selected lambs fed ad libitum (AL) intake was slaughtered when the lambs reached an average BW of 28.6 kg. The remaining 21 lambs were allotted randomly to three levels of dry matter intake: AL or restricted to 70 or 40% of the AL intake. All lambs were slaughtered when the sheep fed AL intake reached 35 kg of BW. Total body N and N retention were determined. The results showed that the maintenance requirements for NP and MP were 1.75 and 3.37 g kg−1 metabolic shrunk body weight (SBW0.75), respectively. The partial efficiency of protein use for maintenance was 0.52. The NP requirements for growth ranged from 10.9 to 42.4 g d−1 for the lambs gaining 100 to 350 g d−1 from 20 to 35 kg BW. The partial efficiency of MP for growth was 0.52. In conclusion, the NP and MP requirements for the maintenance and growth of Dorper crossbred female lambs were lower than those reported by AFRC (1993) and NRC (2007) recommendations.http://www.sciencedirect.com/science/article/pii/S2095311916614557growthmaintenancemetabolizable proteinnet proteinlamb |
| spellingShingle | Tao MA Kai-dong DENG Yan TU Nai-feng ZHANG Bing-wen SI Gui-shan XU Qi-yu DIAO Protein requirements of early-weaned Dorper crossbred female lambs Journal of Integrative Agriculture growth maintenance metabolizable protein net protein lamb |
| title | Protein requirements of early-weaned Dorper crossbred female lambs |
| title_full | Protein requirements of early-weaned Dorper crossbred female lambs |
| title_fullStr | Protein requirements of early-weaned Dorper crossbred female lambs |
| title_full_unstemmed | Protein requirements of early-weaned Dorper crossbred female lambs |
| title_short | Protein requirements of early-weaned Dorper crossbred female lambs |
| title_sort | protein requirements of early weaned dorper crossbred female lambs |
| topic | growth maintenance metabolizable protein net protein lamb |
| url | http://www.sciencedirect.com/science/article/pii/S2095311916614557 |
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