Effect of Age at First Calving on First Lactation Milk Yield in Holstein Cows from Costa Rican Specialized Dairy Herds

Published on: 10/04/2021
Author/s : Mauren Salazar-Carranza 1, Gloriana Castillo-Badilla 2, Jaime Murillo-Herrera 1, Frank Hueckmann-Voss 1, Juan José Romero-Zúñiga 2,3. / 1 Private Consultant; 2 Herd Health and Production Control Department, School of Veterinary Medicine, Universidad Nacional, Heredia, Costa Rica; 3 Population Medicine Research Program, School of Veterinary Medicine, Universidad Nacional, Heredia, Costa Rica.

1. IntroductionReducing the production costs is becoming more important in the dairy industry. The suitable development of replacement heifers is an expensive investment for dairy farms, so estimations of all associated costs are about 20% of the total production costs [1].The age at first calving (AFC) reflects the rate of growth of the female. A late entry in the productive life reduces the econ...

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Umberto Francesa Umberto Francesa
Veterinary Doctor
December 7, 2021
Interesting and at the same time debatable. When AFC are based on age and not weigh and high, the expectations of getting a good cow, become slim.

I would suggest a similar analysis on herds in the Highs of Costa Rica, above 1800 msnm,
AFC's in those regions are average to those of European countries.
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