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Article

Effects of Tall Fescue Endophyte Type and Dopamine Receptor D2 Genotype on Cow-Calf Performance during Late Gestation and Early Lactation

1
Department of Animal and Veterinary Sciences, Clemson University, Clemson, SC 29634, USA
2
USDA-ARS Forage Production Research Unit, Lexington, KY 40506, USA
3
Department of Plant and Environmental Sciences, Clemson University, Clemson, SC 29634, USA
*
Author to whom correspondence should be addressed.
Received: 11 February 2021 / Revised: 4 March 2021 / Accepted: 5 March 2021 / Published: 9 March 2021
(This article belongs to the Special Issue Global Impact of Ergot Alkaloids)
Grazing endophyte-infected, toxic tall fescue reduces cow/calf production; therefore, this study examines alternate strategies such as use of novel endophyte fescue varieties during late gestation and early lactation or genetic selection of resistant cows. Pregnant cows (n = 75) were randomly assigned to fescue endophyte type: 1) endophyte-infected ergot alkaloid producing tall fescue (E+) or 2) novel endophyte-infected, non-toxic tall fescue (NOV) within maternal (A|A, n = 38 and G|G, n = 37) DRD2 genotype to examine changes in cow/calf performance and milk production during late gestation and early lactation. Grazing E+ fescue pastures during late gestation reduced cow body weight gain but did not alter calf birth weight compared to NOV. Milk production and calf ADG during the first 30 day of lactation were lower for E+ than NOV. The calving rate was reduced, but not calving interval for E+ cows. The adjusted 205-day weight of calves was lower in those grazing E+ with their dams compared to NOV. There were no interactions between DRD2 genotype and fescue endophyte type indicating that genotype was not associated with response to E+ fescue in this study. Overall, grazing NOV tall fescue pastures rather than E+ during critical stages of production improved cow gain during late gestation, calving rate, early milk production and calf growth. View Full-Text
Keywords: fescue toxicosis; single nucleotide polymorphism; milk production; calf growth fescue toxicosis; single nucleotide polymorphism; milk production; calf growth
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MDPI and ACS Style

Wilbanks, S.A.; Justice, S.M.; West, T.; Klotz, J.L.; Andrae, J.G.; Duckett, S.K. Effects of Tall Fescue Endophyte Type and Dopamine Receptor D2 Genotype on Cow-Calf Performance during Late Gestation and Early Lactation. Toxins 2021, 13, 195. https://0-doi-org.brum.beds.ac.uk/10.3390/toxins13030195

AMA Style

Wilbanks SA, Justice SM, West T, Klotz JL, Andrae JG, Duckett SK. Effects of Tall Fescue Endophyte Type and Dopamine Receptor D2 Genotype on Cow-Calf Performance during Late Gestation and Early Lactation. Toxins. 2021; 13(3):195. https://0-doi-org.brum.beds.ac.uk/10.3390/toxins13030195

Chicago/Turabian Style

Wilbanks, Sarah A.; Justice, Susan M.; West, Thomas; Klotz, James L.; Andrae, John G.; Duckett, Susan K. 2021. "Effects of Tall Fescue Endophyte Type and Dopamine Receptor D2 Genotype on Cow-Calf Performance during Late Gestation and Early Lactation" Toxins 13, no. 3: 195. https://0-doi-org.brum.beds.ac.uk/10.3390/toxins13030195

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