| Registro completo |
| Provedor de dados: |
Acta Agron. (Palmira)
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| País: |
Colombia
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| Título: |
Economic evaluation of puberty induction of nulliparian Nellore heifers using intravaginal device and melengestrol acetate
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| Autores: |
Pereira,Luiz Carlos
de Souza Ferreira,Renan
Fujii Gongalves,Rony
Vinhas Ítavo,Luís Carlos
Signor Kohl,Endyara
Menezes Dias,Alexandre
Barbosa Ferreira,Marcos
Espínala Carvalho,Cristiano Marcelo
Gongalves Mateus,Rodrigo
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| Data: |
2019-09-01
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| Ano: |
2019
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| Palavras-chave: |
Estrus induction
Fertility
Reproductive efficiency
Economic return
Pregnancy rate
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| Resumo: |
Abstract The present study evaluates the economic viability of puberty induction in nulliparous Bos taurus indicus Nellore breed heifers using an intravaginal device of fourth-use and melengestrol acetate (MGA®). The experiment was undertaken in the Nossa Senhora Aparecida Farm, Terenos city, Mato Grosso do Sul, Brazil, and was utilized a completely randomized experimental design in a 2 x 3 factorial scheme. Two age classes were included in the study, which were divided into 348 precocious (early-cycle) heifers, aging 16-18 months, weighting an average of 264.6 kg and 543 conventional-cycle heifers aging 24-26 months averaging 346.8 kg. The three treatments were as follows: control without the induction of follicle formation (treatment 1); treatment 2: induction with an intravaginal implant (intravaginal implantation with a fourth-use progesterone implant on Day 0, withdrawal on Day 12, and application of 1 ml of intramuscular estradiol cypionate [ECP®]); and treatment 3, 2.3 g of MGA® during 12 days with supplement followed by 1 ml of intramuscular ECP® at the end of the treatment. Heifers induced via implantation had a higher rate of ovarian activity (presence of corpus luteum) during the early cycle (63.8% animals) while the conventional cycle (72.4%). This effect influenced the frequency of early stage anestrus (56%). Among the treatments evaluated, 72% of control heifers had no ovarian activity (absence of corpus luteum). In the group with implant induction the conception rates were 65.5% and 62.4% in early and conventional-cycle females, respectively. Puberty induction in Nellore heifers provides a high economic return. The protocol revealed highest efficiency compared to the control group.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122019000300205
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| Editor: |
Universidad Nacional de Colombia
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| Relação: |
10.15446/acag.v68n3.66190
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| Formato: |
text/html
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| Fonte: |
Acta Agronómica v.68 n.3 2019
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| Direitos: |
info:eu-repo/semantics/openAccess
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