Rooster body weight influence on the reproductive performance of the broiler parents

Abstract

In this research influence of the rooster body weight on reproductive performance of broiler parents was examined for Ross 308 and Cobb 500 hybrids. At the beginning of the productive cycle (24 weeks of age) for roosters Ross 308 hybrids average body weight of 3,030.00 g has been determined, while for Cobb 500 rooster average body weight was 3,045.00 g. In the 42nd week of age (middle of productive cycle), body weight of Ross 308 roosters was 4,306.00 g and 4,323.00 g for Cobb 500 roosters, while at the end of productive cycle in the 61st week of age Ross 308 hybrids had average 4.908,00 g and Cobb 500 had 4,918.50 g. Determined differences in body weight of roosters (15.00 g, 17.00 g and 10.50 g) in specific periods of productive cycle, as well as difference in body weight for the entire productive cycle (19.97 g) were not statistically significant (P>0.05). Between rooster body weight and fertilized eggs laying intensity positive statistically significant (P lt 0.001; P lt 0.01; P lt 0.05) correlation coefficients were determined. Between rooster body weight and hatchability percentage of the chicks positive statistically significant (P lt 0.001; P lt 0.01; P lt 0.05) correlation coefficients were determined for both hybrids. However, based on correlation coefficient it has been determined that rooster body weight had positive influence on laying intensity of fertilized eggs till 58th week of age (Ross 308) and 60th week of age (Cobb 500), while on hatchability of chicks it had positive influence till 58th week of age for both hybrids.

Ispitivanje uticaja telesne težine petlova na reproduktivne performanse brojlerskih roditelja sprovedeno je kod hibrida Ross 308 i Cobb 500. Na početku proizvodnog ciklusa (24. nedelja starosti) kod hibrida Ross 308 utvrđena je prosečna telesna težina petlova 3.030,00 g, a Cobb 500 3.045,00 g. U 42. nedelji starosti (sredina proizvodnog ciklusa) telesna težina petlova iznosila je 4.306,00 g (Ross 308) i 4.323,00 g (Cobb 500), dok je na kraju proizvodnog ciklusa (61. nedelja starosti) telesna težina petlova kod hibrida Ross 308 iznosila 4.908,00 g, a hibrida Cobb 500 4.918,50 g. Utvrđene razlike telesne težine petlova (15.00 g, 17.00 g i 10.50 g) u određenim periodima proizvodnog ciklusa, kao i razlika u telesnoj težini petlova za ceo proizvodni ciklus (19.97 g), nisu bile statistički signifikantne (P>0.05). Između telesne težine petlova i intenziteta nosivosti oplođenih jaja utvrđeni su pozitivni statistički značajni (P lt 0.001; P lt 0.01; P lt 0.05) koeficijenti korelacije do 50. nedelje starosti kod hibrida Ross 308, odnosno 53. nedelje kod roditeljskog jata hibrida Cobb 500, a između telesne težine petlova i procenta izvodljivosti pilića utvrđeni su pozitivni statistički značajni (P lt 0.001; P lt 0.01; P lt 0.05) koeficijenti korelacije do 51. nedelje starosti kod oba ispitivana hibrida. Međutim, na osnovu koeficijenata korelacije utvrđeno je da je telesna težina petlova pozitivno uticala na intenzitet nosivosti oplođenih jaja do 58. nedelje starosti (Ross 308), tj. 60. nedelje starosti (Cobb 500), a na izvodljivost jednodnevnih brojlerskih pilića do 58. nedelje starosti kod oba ispitivana roditeljska jata. PR Projekat Ministarstva nauke Republike Srbije, br. TR - 31033.