TAILIEUCHUNG - Báo cáo sinh học: "Comparative study of growth in poultry"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Comparative study of growth in poultry | Genet Sei Evol 1995 27 365-375 @ Elsevier INRA 365 Original article Comparative study of growth curves in poultry H Knfzetova J Hyánek L Hyánková p Belfcek Research Institute of Animal Production 104 00 Prague lO-Uhrineves Czech Republic Received 26 April 1993 accepted 6 February 1995 Summary - This paper compares the growth patterns of chickens turkeys ducks and geese. The growth curves and their parameters were estimated by the Richards function. In this work weight data of females of current sire lines 62 chickens 47 ducks and 42 geese and commercial medium-type hybrids 27 turkeys were used. Birds were fed ad libitum and weighed at 7 or 14 d intervals up to 18-28 weeks of age. The accuracy of the curve fit was high in all species R2 to . The ratios y 1A weight at the inflection point over mature weight which determine the shape of the growth curve were and in chickens turkeys ducks and geese respectively. Only the growth pattern of the Galliforms did not significantly differ from the Gompertz type of growth y A . The age at the inflection point confirmed the high early growth of geese t d and ducks t d . The chickens finished the autoacceleration phase of growth at d and turkeys at d of age. The phenotypic correlations between the inflection parameters t and y were higher in waterfowl than in chickens and turkeys. The inflection parameter t 1 and y were positively associated with the maturing index k in ducks and geese and negatively in chickens and turkeys. The evolutionary aspects of the interspecific differences are discussed. growth curve turkey waterfowl chicken evolution Resume Etude comparative des courbes de croissance de volaille. L article compare les patrons de croissance du poulet de la dinde du canard et de I oie. Les courbes de croissance et leurs paramètres ont été estimés selon 1 équation de Richards. L analyse a porté sur les poids de femelles de lignées paternelles courantes 62 .

• Báo cáo khoa học
• Báo cáo sinh học hay
• cách trình bày báo cáo
• báo cáo sinh học
• công trình nghiên cứu sinh học
• tài liệu về sinh học