Badr, A. (2020). Distribution of Nulliparous Fertility Traits. Journal of Animal and Poultry Production, 11(5), 193-198. doi: 10.21608/jappmu.2020.104946
Anas A. A. Badr. "Distribution of Nulliparous Fertility Traits". Journal of Animal and Poultry Production, 11, 5, 2020, 193-198. doi: 10.21608/jappmu.2020.104946
Badr, A. (2020). 'Distribution of Nulliparous Fertility Traits', Journal of Animal and Poultry Production, 11(5), pp. 193-198. doi: 10.21608/jappmu.2020.104946
Badr, A. Distribution of Nulliparous Fertility Traits. Journal of Animal and Poultry Production, 2020; 11(5): 193-198. doi: 10.21608/jappmu.2020.104946
Animal Production Research Institute, Ministry of Agriculture and Land Reclamation, Nadi El-Said Str., Dokki, Giza, Egypt;
Abstract
Reproductive data of Egyptian Friesian heifers were collected from 1979 to 2013 to study the normality of fertility traits (age at first breeding, age at successful breeding, age at first calving, number of services per conception, conception rate and service period) and to examine environmental factors affecting these traits. A secondary objective was to compare different age at first breeding and its effect on fertility traits of heifers. Age at first breeding, age at successful breeding and age at first calving exhibited symmetrical distribution (bell shape), however number of services per conception, conception rate and service period exhibited lack of symmetrical distribution (L shape). Square root transformation decreased the variability for number of services per conception and conception rate however logarithmic transformation was the best for service period. Youngest heifer at first breeding (13 mo.) needed only one service to be pregnant with zero SP and CR was near to 100%.
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