215 Supplementation with beta-carotene and vitamins improves pregnancy rate after timed-AI in beef Nellore cows grazed in pasture systems | Zendy

Luana Factor | Zendy; Guilherme S Vasconcellos | Zendy; Tiago S Acedo | Zendy; Victor V Valério de Carvalho | Zendy; Bruna Lima Chechin Catussi | Zendy; Pietro Sampaio Baruselli | Zendy

Open Access

215 Supplementation with beta-carotene and vitamins improves pregnancy rate after timed-AI in beef Nellore cows grazed in pasture systems

Author(s) -

Luana Factor,

Guilherme S Vasconcellos,

Tiago S Acedo,

Victor V Valério de Carvalho,

Bruna Lima Chechin Catussi,

Pietro Sampaio Baruselli

Publication year - 2020

Publication title -

journal of animal science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.928

H-Index - 156

eISSN - 1525-3015

pISSN - 0021-8812

DOI - 10.1093/jas/skaa278.281

Subject(s) - zoology , ice calving , beef cattle , beta carotene , artificial insemination , insemination , medicine , pregnancy rate , vitamin , pregnancy , endocrinology , biology , lactation , sperm , andrology , genetics

The aim was to evaluate the effects of beta-carotene and vitamins (A, D3, E and biotin) on reproductive performance of grazing Nellore cows calving in different moments. A total of 497 multiparous cows (5.68 ± 0.11 parities) were homogeneously divided in 4 paddocks (Brachiaria brizantha spp.) according to BCS (2.8 ± 0.27), following a completely randomized design in a 2 x 2 factorial arrangement, being the factors: calving moment [CM = early October (EO; 1st-15th) or late October (LO; 16th-31st)]; and supplementation (SUP): control [(mineral supplementation, Fosbovi® Reprodução; n = 251) or vitamins (control + beta-carotene (150 mg), vitamins A (40.000IU), D3 (5.000IU), E (300 mg) and biotin (20 mg)/cow/day; n = 246)]. Mineral supplement and vitamins were daily offered for 60 days (30d before to 30d after 1st FTAI), and provided by DSM Produtos Nutricionais Brasil S.A. Cows were synchronized (1st FTAI) with a P4/E2-based FTAI protocol, and open cows were resynchronized (2nd FTAI) 30 days after the first insemination. The 1st FTAI conception rate (CR) tended to be greater for vitamins group, compared to control [64.2%(158/246) vs. 56.6%(142/251); P = 0.08], regardless of CM. The CM*SUP interaction was significant for CR at 2nd FTAI, with vitamins presenting higher CR over control in LO moment [52.1% (38/73) vs. 41.4% (24/58), P = 0.0053]. Greater cumulative CR (1st + 2nd FTAI) was observed for vitamins over control [83% (204/246) vs. 79% (198/251); P = 0,058], and for LO compared to EO [86% (157/183) vs. 78% (245/314); P = 0.01], without CM*SUP significance. The BCS was higher for the vitamins group, compared to control, at AI moment (3.00 vs. 2.81, P < 0.0001) and 30 days after AI (3.11 vs. 3.03, P < 0.0001), regardless of CM. The inclusion of beta-carotene and vitamins A, D3, E and biotin in mineral supplements is a tool to optimize reproductive performance and BCS of grazing Nellore beef cows during breeding season.

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