Efeito da bioestimulação, monensina e somatotropina recombinante bovina sobre o ganho médio diário e início da puberdade em novilhas Girolando criadas a pasto
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Data
2008
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Resumo
To evaluate the effect of three management strategies on ovarian function of Girolando
heifers raised in a pasture-based system, 80 females with 10 months of age and weight
169,3 ± 26,4 kg were divided in eight groups and submitted by 180 days to the treatments:
Control (T1); Biostimulation (T2); Monensin (T3); Recombinant bovine somatotropin (BST)
(T4); Biostimulation and Monensin (T5); Biostimulation and BST (T6); Monensin and BST
(T7); Biostimulation, Monensin and BST (T8). Oestrus activity was evaluated daily and
heifers were weighted every 15 days. Starting from the 15th month of age animals were submitted to ovarian evaluation by ultrasound to verify follicles and corpus luteum. Daily
weight gain (kg) was 0,52 ± 0,02 (T1); 0,42 ± 0,03 (T2); 0,68 ± 0,04 (T3); 0,43 ± 0,03 (T4);
0,42 ± 0,04 (T5); 0,42 ± 0,02 (T6); 0,70 ± 0,04 (T7) and 0,53 ± 0,01 (T8), with differences
(P<0,05). Weight on the 16th month of age varied from 270 kg (T2) to 323 kg (T3), with
differences (P<0,05). The signals of oestrus where observed in females starting from the
13th month of age and the higher concentration of these signals being observed at the
14th (T8) and 15th (T3), compatible with the ovarian activity to the 15 months when the
animals of these groups had antral follicles or corpus luteum. The present results allow to
conclude that the offer of monensin to pre-pubertal Girolando heifers, alone or in
association with bioestimulation and BST allows homogenizing the age at puberty in
pasture-based systems, reducing the age of the first service and calving.
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Estro, Fêmeas, Manejo, Reposição, Female, Management, Oestrus, Reposition
Citação
LIMA, C. S.; GAMBARINI, M. L.; VIU, M. A. O.; CAIXETA, L. S. ; FILHO, B. D. O.; SANTOS, F. C.; CAIXETA, L. S. Efeito da bioestimulação, monensina e somatotropina recombinante bovina sobre o ganho médio diário e início da puberdade em novilhas Girolando criadas a pasto. Archives of Veterinary Science, Curitiba, v. 13, n. 2, p. 93-97, 2008.