Authors
Abstract
In accordance with the current regulations for the payment of milk in Colombia producers should point decision making on crossing based on the impact it has on the income level.The objective of this study was to analyze productive, reproductive and quality of milk parameters in Holstein (HO), Jersey (JE) cows and their crosses to generate useful information that would contribute to the management of dairy herds. The data correspond to a system of specialized milk production on technical parameters over 15 years (1998-2012). A univariate analysis was performed determining the mean and standard deviation for productive parameters and an analysis of variance (ANOVA) for the comparison of means. The results showed that the Jersey breed has the best compositional quality parameters: fat 4.39 %, protein 3.68 % vs. 3.24 % and 3.12 % (P<0,05) compared to the Holstein breed, while adjusted lactation (305 days) of Holstein was 5,277 l vs. 4,844 l for Jersey (P<0,05). Real lactation for Holstein and Jersey was similar, 5,665 l vs. 5,686 l (P<0.05). The first calving interval service (FCS) was 81,25 days for Holstein and 72.77 days for Jersey (P<0.05) while the calving interval (CI) was lower for Holstein, 414 days vs. 446 days in for Jersey (P<0.05); in the open days (OD) parameter and calving interval (CI) Jersey x Holstein was significantly better. Regarding economic parameters, if milk payment were done because of parameters such as fat and protein, Jersey would be the breed of choice.
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References
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