Effects of oviposition time, hen age, and extra dietary calcium on egg characteristics and hatchability

Journal of Applied Poultry Research

Volumn 6, Issue 3, 1997, Pages 335-343

  Novo, R P ^a   Gama, L T ^a   Soares, M Chaveiro ^a  

^a INSTITUTO SUPERIOR DE AGRONOMIA   (Portugal)

Author keywords

Broiler hatchability; Calcium supplement; Egg specific gravity; Hen age; Oviposition time

Indexed keywords

AVES;

EID: 0041971632     PISSN: 10566171     EISSN: None     Source Type: Journal    
DOI: 10.1093/japr/6.3.335     Document Type: Article

References (44)

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18. Data were analyzed by analysis of covariance with the General Linear Models procedure (PROC GLM) of SAS [19]. Hatchability, embryo viability and sources of mortality were coded as 0 or 1 and analyzed accordingly, as indicated by Harvey [20]. In a preliminary analysis the linear model included the effects of calcium supplementation and breeder age as discrete independent variables and time of opposition as a linear covariate, with 3 two-way interactions between these factors. If an interaction was not statistically significant (P > .05) for a given response variable, it was dropped and the reduced model run in order to obtain least-squares means and estimates of regression coefficients on time of oviposition. The latter were obtained either as pooled coefficients or within age or treatment, according to the significance of the interactions. Results for total eggs were based on data from 13,500 eggs; results for fertile eggs, on 13,145 eggs.
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