Effect of frequency of mineral and vitamin supplementation on testes and semen quality traits of Angora sires

 

A. Baca, M.A. Snyman, E. Kilian

Grootfontein Agricultural Development Institute, Private Bag X529, Middelburg (EC), 5900, South Africa, Corresponding author:

Ayanda Baca

 

The quality of the fresh Angora goat semen is often blamed for the poor results obtained when freezing Angora goat semen. The effect of frequency of mineral and vitamin supplementation on testes and semen quality traits of Angora sires was evaluated in this study. Forty rams were divided on a stratified origin, age and body weight basis into four groups of 10 animals each. The rams were kept in kraals with adequate shade facilities. All the groups received a high energy and protein diet. The frequency of mineral and vitamin supplementation for Groups 1 and 4 was every four weeks whereas Groups 2 and 3 received supplementation every six and eight weeks respectively. Group 4 received 150 g of lupins per day additionally as a side dish. The rams were exercised daily during the week by letting them walk at a fast pace for at least an hour during the trial period. The frequency of supplementation of vitamins (A, D, and E) and trace minerals to Angora rams had no significant effect on testes traits and semen quality in terms of motility, density, volume and percentage of live sperm. Supplementation with lupins also did not have an effect on the testes and semen quality traits. Semen motility and percentage of live sperm in the majority of the rams were good and should not provide a problem for freezing. Semen density at most collection dates was categorised as milky to creamy, indicating average to good sperm concentration. Semen colour was categorised as cream in most cases. The high energy and protein diet provided, together with the supplementation of vitamins and trace minerals to Angora rams subjected to a regular exercise program, would ensure semen of good enough quality for a freezing protocol.

 

Published

Proceedings 46th SASAS congress, Bloemfontein