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Effect of peri-parturient Monensin supplementation on endocrine and metabolic adaptation to early lactation as well as on postpartum reproduction in dairy cows calving in different body conditions

  • M. Kulcsar (a1), Gy. Huszenicza (a1), P. Korodi (a1), P. Ribiczei-Szabo (a1), J. Bartyik (a1), L. Katai (a1), J. Schmidt (a2), Sz. Janosi (a3), S. Dieleman (a4), J. A. Nikolic (a5), L. Kormanek (a1), P. Rudas (a1), H. Samanc (a6) and I. Ivanov (a6)...

The consequences of peri-parturient Monensin administration were studied in two dairy herds in ≥ 2 parity HF cows (1) calving in moderate body condition (score, BCS: 3.25-3.75) and producing ≥8500 kg FCM in the previous lactation (Herd K), as well as (2) in those being overfed before calving (BCS: ≥3.75), but producing less milk (5-8000 kg FCM) (Herd S). In both herds on days 249-256 of gestation half of the cows received an intraruminal constant release capsule of Monensin (Rumensin® capsule, ELANCO) (Monensin-K and Monensin-S cows), the others remained untreated controls (Control-K and Control-S cows). Blood samples were taken on day 1-3 after calving and again 4 times with 7 days intervals to assay certain hormones and metabolites. On days 1-3 and again on days 28-35 also the ACTH induced Cortisol response and TRH induced T4/T3 responses were determined. The resumption of ovarian cyclicity was followed by milk progesterone profiles. In the first 10 weeks after calving the milk production of Monensin-K cows (n=13) did not differ from that of Control-K cows (n=14). The cows lost their body weight continuously in the first 10 weeks of lactation in Herd S, whereas only in the first 5 weeks in Herd K. Monensin only slightly influenced the degree of weight loss (on both farms), and the circulating leptin level (determined only in Herd S). Significantly lower insulin, IGF-1, T4, T3, glucose and cholesterol levels as well as less elevated βOH-butyrate and non-esterified fatty acid concentrations were seen in Control-S (n=13) than in Monensin-S (n=ll) cows, first of all in the first two weeks after calving. These ionophor-related differences were less obvious or disappeared in Herd-K. Monensin shortened the postpartum acyclic and anestrous periods as well as the calving to re-conception interval but this effect was significant only in the Herd S.

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BSAP Occasional Publication
  • ISSN: 0263-967X
  • EISSN: 2053-5953
  • URL: /core/journals/bsap-occasional-publication
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