efeito da duração do tratamento com progestágeno e da maturidade sexual na taxa de prenhez em novilhas de corte: avaliação econômica e biológica effect of the duration of progestagen exposure and sexual maturity on the pregnancy rate of beef heifers: economic and biological evaluation

Clicks: 293
ID: 202819
2009
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Abstract
Os objetivos neste experimento foram avaliar o efeito do tempo de exposição a um progestágeno (P4) na taxa de prenhez de novilhas púberes e pré-púberes inseminadas em tempo-fixo (IATF) e estudar o retorno econômico dos protocolos utilizados, por meio da comparação desses protocolos ao sistema tradicional de acasalamento natural aos 26 meses de idade. Foram utilizadas 114 novilhas da raça Bradford com 16 meses de idade, classificadas em quatro grupos de acordo com o tratamento e a maturidade sexual: GPPLP - pré-puberes, longo tratamento com P4 (n=21); e GPPCP - pré-puberes, curto tratamento com (n=19); GPLP - púberes, longo tratamento com P4 (n=34); e GPCP - púberes, curto tratamento com P4 (n=40). As novilhas do GPPLP e GPLP receberam no dia -8 um pessário intravaginal impregnado com acetato de medroxiprogesterona. No dia 0, o pessário foi removido e outro foi inserido, juntamente com uma injeção de 2,5 mg de benzoato de estradiol (BE). No dia 8, o pessário foi retirado e as novilhas receberam 0,5 mg de BE e 250 µg de cloprostenol sódico. A inseminação artificial em tempo fixo (IATF) foi realizada 54 horas depois. As novilhas do GPPCP e GPCP receberam o mesmo tratamento de sincronização dos grupos GPPLP e GPLP, com exceção do AMP do dia -8 ao dia 0. A taxa de prenhez foi maior nas novilhas púberes (60,3%) que nas pré-puberes (35,0%). No entanto, não foi detectado efeito do tempo de tratamento na taxa de prenhez nas novilhas púberes e pré-puberes. A resposta econômica na utilização de protocolos com P4 foi maior em novilhas aos 16 meses que no sistema de acasalamento aos 26 meses. A exposição prolongada a um P4 não foi eficiente para aumentar a taxa de prenhez de novilhas submetidas a IATF.
The aim of this experiment was to evaluate the effect of the duration of progestagen (P4) exposure and sexual maturity of prepubertal and pubertal heifers submitted to timed artificial insemination (TAI). A hundred and fourteen 16- month old Bradford heifers were classified, according treatment and sexual maturity, in 4 groups: PPLPG (prepubertal long exposure to P4, n=21), PPSPG (prepubertal short exposure to P4, n=19), PLPG (pubertal long exposure to P4, n=34) and PSPG (pubertal short exposure to P4, n=40). On day -8, the heifers from PPLPG (prepubertal long exposure to progestagen) and PLPG (pubertal long exposure to progestagen) received an intravaginal sponge impregnated with medroxiprogesterone acetate (MAP). On day 0 the sponge was removed and a new sponge was inserted, together with an injection of 2.5 mg estradiol benzoate (EB). On day 8 the sponge was removed and the heifers received an injection of 0.5 mg EB and 250 ìg sodium cloprostenol. The TAI was performed 54 hours after sponge withdrawal. The heifers from PPSPG and PSPG received the same synchronization treatment, except for the additional MAP from day -8 to day 0. The pregnancy rate was higher in pubertal (60.3%) than in pre-pubertal (35.0%) heifers. However, there was no effect of the duration of treatment in the pregnancy rate between pubertal and prepubertal heifers. The second part of this study aimed to evaluate the economical return of the protocols and compare them with the traditional breeding system at 26 months of age. A better economic response with the use of protocols associating P4 in heifers at 16 months was observed compared to the traditional system at 26 months of age. The prolonged exposure to P4 did not improved pregnancy rate in heifers submitted to TAI.
Reference Key
pfeifer2009revistaefeito Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Luiz Francisco Machado Pfeifer;Eduardo Madeira Castilho;Victor Fernando Büttow Roll;Augusto Schneider;Evâneo Alcides Ziguer;Nelson José Laurino Dionello
Journal european journal of lipid science and technology
Year 2009
DOI
10.1590/S1516-35982009000700007
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700007
Keywords
cattle progesterone bovinos

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