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Author

G. Colas

Bio: G. Colas is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 57 citations.


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Journal ArticleDOI
TL;DR: There was improvement in all semen and spermatozoa traits with age, the means at 12 months being consistently superior to values at 6 and 9 months of age, and differences were attributed primarily to nutrition.

119 citations

Journal ArticleDOI
TL;DR: Seasonal changes in the activity of the antioxidant enzyme defense system comprising superoxide dismutase, glutathione reductase, GPx and catalase in seminal plasma of mature Rasa Aragonesa rams were determined.

103 citations

Journal ArticleDOI
TL;DR: Seasonal variations in semen characteristics of Persian Karakul rams trained to serve the artificial vagina are evaluated for volume, total sperm output, mass motility and the percentage live sperm.

96 citations

Journal ArticleDOI
TL;DR: The existence of differences among rams within each breed in semen quality and quantity makes it necessary to perform a semen evaluation on individual basis in order to select the best males before they are used for breeding.

91 citations

Journal ArticleDOI
Luis A. Zarazaga1, J.L. Guzmán1, C. Domínguez1, M.C. Pérez1, R. Prieto1 
TL;DR: It is concluded that Payoya bucks exhibit large seasonal variation in their reproductive activity, and higher feeding level allowed a better sexual behaviour in bucks in late spring, when male effect is used on the local livestock to breed females.

79 citations