Cristina Cprtinhas

DSM (Netherlands)

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Luana Factor

Universidade de São Paulo

R.C. Chebel

University of Florida

Victor V Valério de Carvalho

DSM (Netherlands)

Pietro Sampaio Baruselli

Universidade de São Paulo

Guilherme S Vasconcellos

DSM (Netherlands)

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Universidade de São Paulo

University of Florida

DSM (Netherlands)

Hospital Universitário da Universidade de São Paulo

Florida College

University of Minnesota

University of California, Davis

University of Idaho

College of Idaho

Washington State University

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Effects of Supplementation of Grazing Nellore Cows with Β-Carotene and Vitamins a + D3 + E + Biotin on Follicle Diameter, Estrus, Establishment of Pregnancy, and Fetal Morphometry

Luana Factor R.C. Chebel Guilherme S Vasconcellos Victor V Valério de Carvalho Cristina Cprtinhas

The objectives of this experiment were to evaluate the effects of supplementation of Nellore (Bos indicus) cows with β-carotene + vitamins A + D3 + E + biotin on body condition score (BCS), estrus, pregnancy, and fetal morphometry. Lactating cows (n = 497)from two herds were balanced for BCS and calving period [early calving (EC); late calving (LC)] and were assigned randomly to: Control (n = 251) – supplementation with a mineral supplement; and, SUP (n = 246) – supplementation with the mineral supplement fed to control + β-carotene (150 mg/d) + vitamin A (40,000 IU/d) + vitamin D3 (5,000 IU/d) + vitamin E (300 mg/d) + biotin (20 mg/d). Cows were supplemented from d -30 to 30 (d 0 = timed artificial insemination; TAI). Pregnancy was diagnosed 30 d after TAI and fetal crown-rump distance and thoracic diameter were measured at 30 and 77 d of gestation. Cows in the SUP treatment were more likely to have BCS ≥ 3.0 on d 0 (74.8 ± 2.8 vs. 56.6 ± 3.1%) and were more likely to gain BCS from d 0 to 30 (57.7 ± 3.3 vs. 44.1 ± 3.3%). Fewer LC cows in the SUP treatment were detected in estrus at the time of the first TAI (64.0 ± 5.2 vs. 75.4 ± 4.4%). There was a tendency for the SUP treatment to increase pregnancy to the first TAI (64.2 ± 3.0 vs. 56.6 ± 3.1%). A greater percentage of SUP cows was detected in estrus at the time of the second TAI (70.1 ± 5.0 vs. 52.3 ± 4.8%). The SUP treatment increased pregnancy to the second TAI among LC cows (75.9 ± 8.0 vs. 50.0 ± 8.3%). The SUP treatment increased fetal size at 30 d of gestation and, despite decreasing crow-rump length at 77 d after the first TAI among EC cows, it increased the thoracic diameter at 77 d after the first TAI independent of calving season. Our results support that pregnancy establishment and fetal growth can be improved when grazing Nellore cows are supplemented with β-carotene and vitamins A + D3 + E + biotin.

Carotene

10.2139/ssrn.4399161

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