March 2014
Socio-economic characteristics and husbandry practices of cattle breeders in the Vina division, Cameroon
In order to assess socio-economic characteristics of cattle breeders and their effect on farmers’ practices, a survey was carried out in Vina division within the Adamawa highlands of Cameroon, from November, 2009 to October, 2010. Data were collected from 159 farmers in 9 localities, using a structured questionnaire. Information on breeder’s ethnic group, age, marital status, education level, number of...
March 2014
Heritability and correlation among first lactation traits in Holstein Friesian cows at Holeta Bull Dam Station, Ethiopia
Records of 433 cows from 48 sires that had at least four daughters were used to study genetic parameters for age at first calving, 305 day milk yield, first lactation milk yield, first lactation length, first service period, first dry period and first calving interval. Data were analyzed by the procedures of Restricted Maximum Likelihood Method with animal model. Age at first calving had highest heritability of...
March 2014
Empirical models used for lactation curve analysis in the Chiapas sheep breed using random regression models
The objectives of the study were to compare the goodness-of-fit of seven empirical models (orthogonal Legendre polynomials Order 1 to 4; Wood, Ali and Schaeffer and Wilmink functions) to fit lactation curves of three local colour phenotypes (brown, white, and black) of the Chiapas sheep breed; and to evaluate the effect of environmental factors affecting the parameters of the lactation curve of the model of best fit. A...
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