TAILIEUCHUNG - Báo cáo sinh học: "Genetic properties of feed efficiency parameters in meat-type chickens"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học quốc tế đề tài: Genetic properties of feed efficiency parameters in meat-type chickens | Aggrey et al. Genetics Selection Evolution 2010 42 25 http content 42 1 25 Ge n et i cs Selection Evolution RESEARCH Open Access Genetic properties of feed efficiency parameters in meat-type chickens Samuel E Aggrey 1 2 Arthur B Karnuah1 Bram Sebastian2 and Nicholas B Anthony3 Abstract Background Feed cost constitutes about 70 of the cost of raising broilers but the efficiency of feed utilization has not kept up the growth potential of today s broilers. Improvement in feed efficiency would reduce the amount of feed required for growth the production cost and the amount of nitrogenous waste. We studied residual feed intake RFI and feed conversion ratio FCR over two age periods to delineate their genetic inter-relationships. Methods We used an animal model combined with Gibb sampling to estimate genetic parameters in a pedigreed random mating broiler control population. Results Heritability of RFI and FCR was . Thus selection on RFI was expected to improve feed efficiency and subsequently reduce feed intake FI . Whereas the genetic correlation between RFI and body weight gain BWG at days 28-35 was moderately positive it was negligible at days 35-42. Therefore the timing of selection for RFI will influence the expected response. Selection for improved RFI at days 28-35 will reduce FI but also increase growth rate. However selection for improved RFI at days 35-42 will reduce FI without any significant change in growth rate. The nature of the pleiotropic relationship between RFI and FCR may be dependent on age and consequently the molecular factors that govern RFI and FCR may also depend on stage of development or on the nature of resource allocation of FI above maintenance directed towards protein accretion and fat deposition. The insignificant genetic correlation between RFI and BWG at days 35-42 demonstrates the independence of RFI on the level of production thereby making it possible to study the molecular physiological and nutrient .

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