Poultry and Non-ruminants
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Browsing Poultry and Non-ruminants by Subject "Age"
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Item Effects of Age in Lay and Egg Size on Fertility and Hatchability of Chicken Eggs(1993) Asuquo, B. O.; Okon, B.Ferility and hatchability are major parameters of reproductive performance which are most sensitive to environmental and genetic influences (Stromberg. 1975). Factors affecting these two indices of hatchery profitability include plane of nutrition, conditions and length of storage of eggs, strain, egg' quality and mating ratio (Landauer. 1967; North, 1981; Pascal, 1981; Stahl et aI., 1986: Peedbles and Brake, 1987). Conflicting observations have been made on the effect of age of birds in lay and egg size on fertility and hatchability. Oluyel1\i and Roberts (1979) fOlDl.d no significant effect of egg size on hatchability but Williamson and Payne (1978) found that small and large eggs were significantly poorer in hatchability than medium size eggs. Egg size differential within the intermediate range did not affect hatchability (Landauer. 1967).Item Short-Term Effects of Age, Egg Production Rate and Oviposition Time on Shell Quality and Albumen + Yolk Proportions of Harco Strain Layers(1992) Essien, A. I.; Department of Animal Science, University of Cross River State Okuku, Nigeria.One hundred and forty-four newly-laid eggs produced by the Harco Strain of chickens aged 5weeks were used in the evaluation of the effects of layer age, egg production rate oviposition a 12-week study, values for shell weight. Albumen + yolk weight, percentage albumen + yolk for eggs laid in the morning were significantly (P<0.05) higher than for the eggs laid in the afternoon. Eggs laid in the afternoon had thicker (P<0.05) shells and higher percentage shell weights. Correlation coefficients (r) between shell weight, percentage shell weight, shell thickness, albumen + yolk weight, percentage albumen + yolk and age of layers were 0.42, 0.25, 0.71, 0.58 and -0.26 respectively, while r values with percentage hen-day production as independent Variable were -0.48, -0.34, 0.32,-0.38, 0.35. Shell thickness was negatively correlated with shell weight (0.51)) and egg weight (-0.49)respectively.
