4.7 Article

The relationships between early lactation energy status indicators and endocrine fertility traits in dairy cows

期刊

JOURNAL OF DAIRY SCIENCE
卷 105, 期 8, 页码 6833-6844

出版社

ELSEVIER SCIENCE INC
DOI: 10.3168/jds.2021-21077

关键词

dairy cow; fertility; energy status

资金

  1. Development Fund for Agriculture and Forestry (Makera) [2210/03.01.02/2015]
  2. Faba Coop (Vantaa, Finland)
  3. NAV Nordic Cattle Genetic Evaluation Ltd. (Arhus, Denmark)
  4. Valio Ltd. (Espoo, Finland)
  5. Viking Genetics (Randers, Denmark)

向作者/读者索取更多资源

This study aimed to investigate the relationships between energy status indicators and fertility traits in dairy cows during different stages of lactation. The findings showed a higher correlation between energy status and fertility traits, especially in multiparous cows.
The relationships between dairy cow milk-based energy status (ES) indicators and fertility traits were studied during periods 8 to 21, 22 to 35, 36 to 49, and 50 to 63 d in milk. Commencement of luteal activity (C -LA) and interval from calving to the first heat (CFH), based on frequent measurements of progesterone by the management tool Herd Navigator (DeLaval), were used as fertility traits. Energy status indicator traits were milk beta-hydroxybutyrate (BHB) concentration provided by Herd Navigator and milk fat: protein ratio, concen-tration of C18:1 cis-9, the ratio of fatty acids (FA) C18:1 cis-9 and C10:0 in test-day milk samples, and predicted plasma concentration of nonesterified fatty acids (NEFA) on test days. Plasma NEFA predictions were based either directly on milk mid-infrared spectra (MIR) or on milk fatty acids based on MIR spectra (NEFAmir and NEFAfa, respectively). The average (standard deviation) C-LA was 39.3 (+/- 16.6) days, and the average CFH was 50.7 (+/- 17.2) days. The correlations between fertility traits and ES indicators tended to be higher for multiparous (r < 0.28) than for primiparous (r < 0.16) cows. All correlations were lower in the last period than in the other periods. In period 1, correlations of C-LA with NEFAfa and BHB, respectively, were 0.15 and 0.14 for primiparous and 0.26 and 0.22 for multiparous cows. The associations between fertility traits and ES indicators indicated that negative ES during the first weeks postpartum may delay the onset of luteal activity. Milk FPR was not as good an indicator for cow ES as other indicators. According to these findings, predictions of plasma NEFA and milk FA based on milk MIR spectra of routine test-day samples and the frequent measurement of milk BHB by Herd Navigator gave equally good predictions of cow ES during the first weeks of lactation. Our results indicate that routinely measured milk traits can be used for ES evaluation in early lactation.

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