Impact of the events occurred pre and postpartum on productive and reproductive performance in the current and subsequent lactation of holstein cows. / Impacto dos eventos ocorridos antes e após o parto sobre o desempenho produtivo e reprodutivo na lactação atual e na posterior de vacas Holandesas.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The objective of this study was to investigate the impact of events occurred pre and postpartum upon milk production at peak, milk production during lactation (305 days) and conception at first service in the current and subsequent lactation of dairy cows. Data related to production and sanity of 2,084 lactations were collected from 665 Holstein cows of a commercial herd from Sao Paulo state. Body condition scores (at drying off and at calving), calving season, dry period length, occurrence of diseases, milk productions (at peak and during lactation) and conception at first service were registered. Statistical analysis was accomplished using multiple and logistic regression. Results showed that calving season (summer), dry period length, body condition score at drying off, natural logarithm of the first somatic cells count (SCC) after calving, occurrence of retained placenta and displacement of abomasum affected negatively milk production at peak in the current lactation, with different effects in function of lactation order. The same events, including the occurrence of clinical mastitis until 60 days post-calving, affected negatively milk production during the current lactation (305 days). Relating to conception at first service in the current lactation, results showed that lactation order, calving season (summer) and body condition score at calving affected negatively the conception, with different effects due to lactation order. Regarding the subsequent lactation, the main events that affected milk production at peak were: calving season (summer), body condition score at drying off, natural logarithm of the first SCC, occurrence of clinical mastitis, number of cases of sub-clinical mastitis during lactation and ketosis. The main factors that affected milk production of the subsequent lactation (305 days) were: body condition score at drying off, occurrence of ketosis and clinical mastitis. In relation to conception at first service in the subsequent lactation, the events that influenced it were: body condition score at drying off, number of cases of sub-clinical mastitis during lactation, occurrence of pneumonia and displacement of abomasum. However, determination coefficients (R2) of the events responsible for impacts on milk production at peak (R2=0.08), milk production during lactation (305 days) (R2=0.06) and conception at first service (R2=0.008) of the subsequent lactation were low.

ASSUNTO(S)

bovino leiteiro metabolismo animal reprodução animal animal reproduction dairy cow milk (production) animal nursing leite (produção) lactação animal animal metabolism

ACESSO AO ARTIGO

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