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Environmental factors influencing milk production during the first three lactations in the belgian black and white breed ii. influence of season of calving age at calving and interval of calving



Environmental factors influencing milk production during the first three lactations in the belgian black and white breed ii. influence of season of calving age at calving and interval of calving



Annales de Medecine Veterinaire 134(7): 479-487



The study concerned 115,774 first lactations, 74,884 second lactations and 46,436 third lactations of Belgian dairy cows (Black and White breed), with calving dates from 1978 to 1987 - (1st lactation), 1979 to 1987 (2nd lactation) and from 1980 to 1987 (3rd lactation). The period from September to December is favourable to quantitative traits (305-day milk, fat and proteins) with a maximum in November. The favourable one for the % of fat is from July to December (maximum in September or October) and for the % of proteins, the maximum is reached in August during the first and second lactation and in September, during the third one. The quantitative traits increased with age at calving. For each of the three lactations, the relation was linear. Qualitative traits decreased with age at calving in second and third lactation, but in first lactation, no particular conclusions has been observed. The relation with interval of calving was curvilinear for quantitative traits, but linear for qualitative traits. However its influence was higher for interval of calving lower than 390 days.

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