Graduate Thesis Or Dissertation
 

The effects of ad libitum feeding 7% crude protein diets with varying energy levels on the reproductive performance of caged broiler breeder males

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  • The reproductive performance of four strains of broiler breeder males (BBM) were compared when housed in individual cages from 22 to 56 weeks of age (WOA), and fed Asi libitum 7% crude protein (CP) diets with 1985, 2424, 2868 kilocalories (kcal) metabolizable (M) energy (E) per kg of feed and a daily restricted 16% CP diet with 2871 kcal ME/kg. Diets consisting primarily of triticale (var:Flora) were fed from 22 to 40 WOA and corn-soy diets from 41 to 56 WOA. Seminal volume, packed sperm cell volume, and body weights were measured biweekly. Seven fertility trials were conducted between 32 and 56 WOA. Testicular weight and abdominal fat were determined at 56 WOA. It was concluded that caged BBM can be maintained on a daily intake of 439 kcal ME and 15.5 g CP per male without adverse effects on reproductive performance; however, the BBM's genotype needs to be considered when feeding the 7% CP diets. The performance of progenies from these four strains of caged BBM were determined in four grow-out trials. The feeding programs of the BBM did not influence progeny body weight, but paternal diet, genotype, and grow-out trial influenced abdominal fat weights. Plasma cholesterol and total protein levels from the same four strains of BBM were measured at 32, 40, and 50 WOA. The mean blood chemistry values were influenced by the strains of BBM within dietary treatment. Significant negative correlations (P<.05) between plasma cholesterol and testicular weight were observed for only one strain of males fed the daily restricted 16%CP-2871 ME diet. In a second study, BBM were equally divided and assigned to either individual cages or litter floor pens, and their reproductive performance was studied from 22 to 56 WOA. The males housed in cages and floor pens were provided either 7% CP or 16% CP diets each containing corn-soy (CS) or corn-yellow pea (CYP) and were fed a daily restricted amount or ad. jibitum. Under the conditions of this study, feeding diets containing the corn-yellow pea (Pisum 5ativum L. variety Miranda) did not have detrimental effects on seminal production, fertilizing capacity, and the subsequent hatchability of fertile eggs. There were however differences in the numbers of males producing semen between the CS and CYP diets. This study demonstrated that individually caged BBM were better seminal producers than males kept in all-male floor pens.
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