Seasonal Variations of Some Trace Elements Concentrations of Baladi Goat Milk and their Relationship with Reproductive Characteristics Under Environmental Conditions of Aswan Governorate | ||
| Journal of Animal and Poultry Production | ||
| Article 2, Volume 7, Issue 10, October 2016, Pages 377-381 PDF (382.54 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jappmu.2016.48745 | ||
| Author | ||
| A. I. Damarany | ||
| Department of Animal and Poultry Production, Faculty of Agriculture and Natural Resources, Aswan University, Egypt. | ||
| Abstract | ||
| This investigation aimed to determine the seasonal variations of zinc and copper concentrations in Egyptian Baladi goat milk, in relation to some reproductive characteristics under environmental conditions of Aswan governorate. Zinc and copper concentrations in Baladi goat's milk were determined using atomic absorption (AA) flame spectrometry techniques. The study was carried out on 32 pregnant Baladi goats that reared under the environmental conditions of Aswan governorate. According to season of kidding, goats were divided randomly into two comparable groups. Goats in the first group kidded in cool season and in the second one kidded in warm season. Results showed that higher concentrations (P <0.05) of zinc and copper were found in Baladi goat's milk during cool months and warm months (0.77± 0.324 and 0.65 ± 0.012 vs. 0.48 ± 0.113 and 0.23 ± 0.011 mg/l) respectively. Kidding and twinning rates were insignificantly higher in Baladi goats kidded during the cool season (151.7 and 68.2%) than the warm season (144.4 and 61.5%). Rates of stillbirth, abortion and retained placenta were insignificantly higher in Baladi goats kidded during the warm season (15.4, 15.6 and 18.5%) compared with (11.4, 9.4 and 17.2%) in cool season, respectively. There is a positive correlation between copper concentrations in Baladi goats milk and both kidding and twining rates. Similar trend, showed between zinc concentrations and kidding rate (r= 0.589, 0.577 and 0.614), respectively. There was negative correlation between zinc and copper concentrations in Baladi goat's milk and stillbirth, abortion rates. Similar trend, showed with retained placenta rate. The study observed that the seasonal changes in concentrations of zinc and copper in Baladi goat's milk related strongly with reproductive process of goats. The reproductive phenomena of Baladi goats during the cool season was better than that during the warm season. Supplementation of zinc and copper to diets of Baladi goats during the warm season improve the reproductive characteristics. | ||
| Keywords | ||
| Baladi goats; season; zinc; copper; reproductive characteristics | ||
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