Effect of a single growth hormone (rbST) treatment at breeding on conception rates and pregnancy retention in dairy and beef cattle

Starbuck, Melanie J.; Inskeep, E. K.; Dailey, R. A.

doi:10.1016/j.anireprosci.2005.08.010

Cited by 35 publications

(32 citation statements)

References 37 publications

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“…The calving interval of the treated group was shorter (P >0.05) than that in the control, while gestation period remained unaffected. The results of the present study corresponded with the results of Starbuck et al (2006) who reported that, in dairy cows, the treatment with rbST improved conception rates but had no effect on retention of pregnancy. The results suggested that bST had a beneficial effect on reproductive parameters.…”

Section: Resultssupporting

confidence: 81%

Long term use of bovine somatotropic (bST) on reproduction

Jabbar¹,

Ahmad²,

Abdullah³

et al. 2010

SA J. An. Sci.

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The study was conducted to determine the effect of long term use of bovine somatotropic hormone (bST) on days to first oestrus post-partum, number of services per conception, pregnancy rate, lactation length, dry period and calving interval for a period of three years, from 2004 to 2007. Thirty Nili-Ravi lactating buffaloes with approximately similar milk yields and stage of lactation were selected and randomly allocated to two treatments, A and B, with 15 animals in each group. Group A served as control while animals in group B were given injections of bovine somatotropic hormone (250 mg intramuscular per animal) at intervals of 14 days over a period of three years. The calving interval, dry period and lactation length were shorter by 71, 63.9 and 7 days, respectively, in the treated compared with the control group. The days to first oestrus post-partum, service period and services per conception were 160 ± 56.9 vs.98.2 ± 76.4 days, 207.0 ± 85.0 vs. 115.1 ± 107.0 days and 1.47 ± 1.1 vs. 1.31 ± 0.5 in group A vs. B, respectively. Statistically, differences were significant for post-partum oestrous and service period but for services per conception the difference was non-significant. Prevalence of mastitis was significantly higher in the treated animals while differences in body weights of the animals in the groups were not significant.

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Section: Resultssupporting

confidence: 81%

Long term use of bovine somatotropic (bST) on reproduction

Jabbar¹,

Ahmad²,

Abdullah³

et al. 2010

SA J. An. Sci.

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“…Neste experimento, a administração da rbST realizada no dia do estro não aumentou a concentração sérica desse esteróide. Corroborando, estudos têm comprovado ausência de elevação na concentração de P 4 ao ser administrada somatotropina no momento do estro (Starbuck et al, 2006;Haas, 2004;Morales-Roura et al, 2001) ou no quinto dia do ciclo estral (Fonseca et al, 2001b).…”

Section: Resultsunclassified

Inovulação de embriões bovinos recém-colhidos em receptoras tratadas com rbST no dia do estro

Marques¹,

Costa²,

Fernandes

et al. 2009

R. Bras. Zootec.

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e 65,7% (44 das 67 receptoras tratadas com rbST). As concentrações séricas de progesterona obtidas nas amostras de sangue coletadas no dia da inovulação não diferiram com a administração de rbST: 2,54 ± 0,19 ng/mL (sem rbST) e 2,27 ± 0,20 ng/mL (com rbST). Esses resultados indicam que a administração de 500 mg de rbST no dia do estro aumenta a taxa de gestação, mas não influencia a concentração sérica de progesterona de receptoras de embriões recém-colhidos. Palavras-chave: progesterona, taxa de gestação Inovulation of bovine embryos recently collected in receiving treated with rbST in the estrus dayABSTRACT -This study aimed to analyze the effects of rbST administration in the estrous day, on pregnancy rate and progesterone concentration in cows embryo receivers. The subcutaneously administration of rbST (500 mg) was done in 67 receivers, and 77 without the rbST administration (144 receivers totally). The pregnancy determination was done 30 days after the estrous day and the pregnancy rate was different between the treatments where: 32.5% (25 from 77 without rbST administration) and 65.7% (44 from 67 receivers treated with rbST). The serum progesterone concentration from the blood samples collected on the embryo transfer day were not different in presence of rbST treatment: 2.54 ± 0.19 ng/mL (without rbST) and 2.27 ± 0.20 ng/mL (rbST). In brief, these results suggests that 500 mg of rbST administration on the estrous day increase the pregnancy rate, however it does not have influence on serum progesterone concentration in cows receiver of fresh embryos.

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“…(Starbuck et al, 2006). The dynamics of somatotropin specific binding by granulosa cells during maturation of antral follicles differed at dissimilar reproductive states of cows.…”

Section: Introductionmentioning

confidence: 99%