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Communication Dans Un Congrès Année : 2017

Does feeding extruded linseed to dairy cows improve reproductive performance - an observational study

Résumé

The impairment of the dairy cow reproductive performance is one of the key concerns for the modern dairy industry as it is closely related to the dairy herd profitability. Experimental approaches suggested that targeting n-3 polyunsaturated fatty acids (PUFA) in reproductive tissues could improve the follicle development and the oocyte and embryo quality and their environment. However, their impact on reproductive performances couldn't be highlighted in experimental designs due to poor statistical power. Thus the objective of this survey was to quantify the effect on reproductive performances of dairy cows in France fed with feeding extruded linseed (EL), a feed rich in x-linolenic acid. A retrospective study was carried out based on data from dairy herds enrolled in the official Milk Recording Scheme between 2008 and 2015 using Artificial Insemination (AI). Fertility was assessed by the indicator of non-return after a first or second AI between 18 and 200 days. The interval from calving to first service (ICS1) and the interval from calving to conception (ICC) were also investigated. Exposition to EL was obtained from all deliveries of commercial products containing EL. An AI was considered exposed when the cow received EL from calving to 17 days after AI. Two reference populations were used: (1) cows in non-exposed herds with comparative calving systems and located in the same areas, (2) cows in exposed herds that did not receive EL. Number of exposed AI was 200,497 in 2,189 herds with an average daily exposition of 401 g/cow (+-285). On the entire database, the non return rate was 45.8%. The effects of different levels of EL exposure on fertility, and on ICSI and ICC will be assessed respectively using mixed-logistic regression model and multivariable Cox model, adjusted for main factors likely to influence the performance in the following weeks
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Dates et versions

hal-01605674 , version 1 (02-10-2017)

Identifiants

  • HAL Id : hal-01605674 , version 1
  • PRODINRA : 406006

Citer

Thomas Meignan, Aurélien Madouasse, Guillaume Chesneau, Cyril Lechartier, Nathalie Bareille. Does feeding extruded linseed to dairy cows improve reproductive performance - an observational study. 68. Annual Meeting of the European Federation of Animal Science (EAAP), Aug 2017, Tallinn, Estonia. 514 p. ⟨hal-01605674⟩
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