Influencia del microclima en una explotación de vacas lecheras de alta producción sobre la pérdida fetal
Santolaria Blasco, Pilar
Bech Sàbat, Gregori
Yániz, J. L.
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The aim of this study was to determine possible relationships between real farm climate variables, recorded from day 0 to day 40 post-artificial insemination on a 30 min basis, and early fetal loss in high producing dairy cows. The data were derived from 759 cows in one single well-managed, high producing, Holstein-Friesian dairy herd. Six hundred and ninety-two pregnancies (91.2%) bore singletons and 67 (8.8%) carried twins. No triplets were recorded. Pregnancy loss was recorded in 6.7% (51/759) of pregnancies: 5.6% (39/692) in single and 17.9% (12/67) in twin pregnancies. Using logistic regression procedures and based on the odds ratio, the presence of twins led to a 3.98-fold increase in pregnancy failure. A one-unit increase in the cumulative number of hours, with values for the temperature-humidity index value higher than 85 during days 11-20 of the gestation period caused a 1.57-fold increase in the pregnancy loss, whereas the likelihood of fetal loss increased by a factor of 1.16 for each additional episode of acute increases in maximum values on the temperature-humidity index, during gestation days 0-40. Episodes of acute increases in maximum values on the temperature-humidity index were only recorded during the cool period. In conclusion our findings show that cumulative stressful climatic conditions can compromise the success of gestation during both the cool and warm period of the year.
Is part ofXIII Jornadas sobre producción animal : XXXIX jornadas de estudio : 12 y 13 de mayo de 2009, Zaragoza, tomo II, p. 657-659
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