| Relationship between the activity of mitochondrial respiratory chain complexes and feed efficiency in fat-tailed Ghezel lambs. | |
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MedLine Citation:
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PMID: 22147474 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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This study was conducted to investigate relationships between mitochondrial respiratory chain complex activities, feed efficiency, and carcass traits in sheep. A group of Ghezel male lambs sired by a single ram were randomly allotted to individual pens. The lambs were fed ad libitum with a fattening diet containing 30% roughage (corn silage and alfalfa hay) and 70% concentrate for 70 d to individually phenotype each lamb for FCR, adjusted FCR (aFCR), and residual feed intake (RFI). The lambs were then humanely killed and liver, abdominal fat, pelvic fat, cardiac fat, warm and cold carcass weights, as well as the cross sectional area of the LM and the fat depth over the 12(th) rib were determined. A portion of LM was obtained to determine mitochondrial protein and respiratory chain complex activities (Complex I to V). Statistical analysis was carried out based on lambs exhibiting high and low RFI (n = 8), FCR (n = 8), or aFCR (n = 8) phenotypes. The high RFI lambs consumed 110 g more feed daily (P < 0.05) than did the low RFI phenotype with no difference in ADG. Conversely, there was no difference in feed intake between low or high FCR groups but the low FCR phenotype gained 70 g more (P < 0.05) per day compared to the high FCR phenotype. It was determined that all 5 respiratory chain complex activities were greater (P < 0.05) in the low RFI compared to the high RFI phenotype with significant (P < 0.001) negative correlation coefficients between RFI and respiratory chain complex activity. When efficiency was assessed using FCR, only activities of respiratory chain complexes III, IV, and V were less (P < 0.05) in the low-FCR compared to the high-FCR phenotype and there were no differences (P > 0.1) in respiratory chain complex activities between groups when FCR was adjusted for metabolic BW (aFCR). There were no differences (P > 0.1) in carcass traits among any of the feed efficiency phenotypes. The results suggest that the inclusion of respiratory chain complex activities in breeding programs may be helpful in selecting for low-RFI phenotype sheep. |
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Authors:
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H Rajaei Sharifabadi; M J Zamiri; E Rowghani; W G Bottje |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-6 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Animal Science, College of Agriculture, Shiraz University, Shiraz, Iran. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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