Reproductive Behavior of Females in a Subtropical Environment. I. Puberty and Ovulation Frequency in Brahman and Brahman X British Heifers

Plasse, D.; Warnick, A. C.; Koger, M.

doi:10.2527/jas1968.27194x

Cited by 71 publications

(25 citation statements)

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“…Puberty occurs at a later age in zebu, and at a higher percentage of adult body weight. Corpora lutea are palpable in well-fed heifers at 14-24 months (Piasse, Warnick & Koger, 1968b). However, there have been other exceptional reports of first oestrus not occurring until 42-52 months.…”

Section: Pubertymentioning

confidence: 97%

A review of female cattle reproduction with special reference to a comparison between buffaloes, cows and zebu

Dobson¹,

Kamonpatana²

1986

Reproduction

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Section: Pubertymentioning

confidence: 97%

A review of female cattle reproduction with special reference to a comparison between buffaloes, cows and zebu

Dobson¹,

Kamonpatana²

1986

Reproduction

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“…Algumas diferenças endócrinas poderiam estar contribuindo para a obtenção de estádios embrionários mais avançados em zebuínos quando comparados com os obtidos em taurinos. Fêmeas Bos indicus geralmente atingem a puberdade mais tarde (Plasse et al, 1968a;Dobson & Kamonpatana, 1986), têm período de gestação mais longo (Plasse et al, 1968b;Dobson & Kamonpatana, 1986), exibem anestro pós-parto prolongado (Plasse et al, 1968c) e apresentam importante sazonalidade reprodutiva, isto é, tendem a ser acasaladas em dias longos (Chenoweth, 1994). Quanto ao ciclo estral, apresentam estro mais curto (Chenoweth, 1994;Pinheiro et al, 1998) e em menor intensidade, e tendência em não permitir a monta por outras fêmeas.…”

Section: Resultsunclassified

“…Fêmeas zebuínas apresentaram CL menor, com menor conteúdo de progesterona por grama de tecido luteal (Segerson et al, 1984). Neste aspecto, estudos anteriores reportaram que a detecção do CL por palpação transretal é mais difícil em zebuínos do que em taurinos (Plasse et al, 1968a;Vale Filho et al, 1986). Existem evidências de que o CL de Bos indicus produz menos progesterona do que o de fêmeas Bos taurus (Randel, 1989).…”

Section: Resultsunclassified

Estádios de desenvolvimento embrionário de vacas zebuínas superovuladas

Fonseca¹,

Filho²,

Neto

et al. 2001

Arq. Bras. Med. Vet. Zootec.

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Estádios de desenvolvimento embrionário de vacas zebuínas superovuladas Nelore, 12.6% (17/135) Pooled Nelore, 11.1% (15/135) Gir, 5.2% (7/135) Brahman and 3.0% (4/135) Guzerá. Embryos were classified according to quality as grade I, 51.1% (69/135), 43.7% (59/135), 4.4% (6/135), 0.7% (1/135), and according to developmental stage in morulae, 3.7% (5/135), young blastocyst, 16.3% (22/135), blastocyst, 37.0% (50/135), expanded blastocyst, 42.2% (57/135), and hatched blastocyst, 0.7% (1/135). These results showed the predominance of advanced developing stages (blastocyst, expanded blastocyst and hatched blastocyst) witch represented 80% of the total of embryos.

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“…Heat stress from d 4 to 6 postconception can reduce conceptus survival (68, 69), and abnormal conceptus development was noted in females that were stressed at d 1 to 16 of gestation (9,47). Heat stress can increase the incidence of anovulatory estrus (42) and can reduce P 4 content in the corpus luteum (50). Catecholamine and glucocorticoid levels increase during heat stress (2,14,20,66), and luteinizing hormone concentrations decrease (32), indicating that heat-induced alterations in ovarian, pituitary, and adrenal hormone levels will negatively influence certain physiological functions and will impair fertility (13).…”

Section: Introductionmentioning

confidence: 99%