The results of an artificial insemination experiment carried out in the suburban area of N’Djamena are here reported. Two methods of synchronization (Norgestomet combination/estradiol/PGF2a/PMSG and PGF2a only) were used with Chadian zebu and crossed breeds in 2007 and 2008. Females were inseminated after induction of estrus with semen of French Normand breed. The fertility rate was low with PGF2a (29.41%). The results obtained with the combination of several hormones were better (66.66%). The survival rates of crossbreeds were particularly low, 40% in 2007 and 33.33% in 2008, mainly due to the traditional management of the herd and the lack of technical support. The insemination cost of a cow was 39,550 F CFA in 2007 with PGF2a and 59,200 F CFA in 2008 with the method consisting of combining of four hormones. The cost of producing a calf in those two years was very high, 134,470 F CFA in 2007 and 118,400 F CFA in 2008.
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机译:An economic evaluation of soil bioengineering as a method for slope stability on abandoned mine land in Eastern Kentucky <中文篇名〉=肯塔基州东部废矿斜坡稳定性的土壤生物工程 经济评估
机译:Estimativa de estro em vacas leiteiras utilizando quantitative metodos preditivos Dairy cows estrus estimation using predictive and quantitative methods