Mineral supplementation (injectable) improved reproductive performance in Holstein cows managed in a warm summer environment
Sustainability of dairy production depends largely on reproductive efficiency that is affected by heat stress due to high ambient temperature and humidity during summer. Supplementation of minerals has been proposed as a management strategy to minimize adverse impact of heat stress on fertility. The...
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Veröffentlicht in: | Reproduction in domestic animals 2022-08, Vol.57 (8), p.839-848 |
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Sprache: | eng |
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Zusammenfassung: | Sustainability of dairy production depends largely on reproductive efficiency that is affected by heat stress due to high ambient temperature and humidity during summer. Supplementation of minerals has been proposed as a management strategy to minimize adverse impact of heat stress on fertility. The objective of this study was to determine the effects of an injectable mineral supplement (Fosfosan) containing selenium (Se), copper (Cu), potassium (K), magnesium (Mg) and phosphorus (P) on the ovarian structures, reproductive hormones and conception rate of heat‐stressed Holstein cows. Sixteen cows were assigned during summer to one of two treatments, a control group (CON; n = 8) and a mineral‐supplemented group (SUP; n = 8). Ambient temperature and relative humidity records were collected and processed to estimate the temperature–humidity index (THI), which confirmed a heat‐stressed environment during the study (avg. THI = 79.4). Cows were subjected to a fixed‐time artificial insemination (FTAI) program using the CIDR‐Synch synchronization protocol. Traits indicative of ovarian activity were recorded during and after this protocol, as well as serum concentrations of reproductive hormones. Pregnancy diagnosis was made 28 and 35 d after FTAI. A completely randomized block design with repeated measures over time was performed to study ovarian functional structures and its hormonal profiles. Correlations and regressions were estimated to study relationships between ovarian structures and related hormones. Mineral supplementation did not increase follicular diameter or follicular populations (p > .05), yet tended to increase corpus luteum diameter (p |
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ISSN: | 0936-6768 1439-0531 |
DOI: | 10.1111/rda.14125 |