The effect of protein intake on the onset of puberty in Bunaji and Friesian × Bunaji crossbred bulls in Nigeria

Rekwot, P.I.; Oyedipe, E.O.; Akerejola, O. O.; Kumi-Diaka, J.; Umoh, J. E.

doi:10.1016/0093-691x(87)90247-0

Cited by 19 publications

(14 citation statements)

References 12 publications

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“…The exact significance of these episodic peaks is not clear but may be related to the sexual and behavioral states of the animals or adjustments to photoperiodicity, temperature and postural states of the animals (Sanwal et al 1974). The testosterone profiles observed were episodic, pulsatile or temporal in nature and this agrees with the results obtained in bulls (Agarwal et al 1983;Rekwot et al 1987).…”

Section: Discussionsupporting

confidence: 81%

“…This may be a result of species differences and also the duration of the present study (3 months) being less than the present study (7 months). However, the testosterone concentrations of the bucks showed fluctuations, with one to three distinct episodic peaks, in agreement with the findings of Sanwal et al (1974), Agarwal et al (1983) and Rekwot et al (1987) in bulls. The exact significance of these episodic peaks is not clear but may be related to the sexual and behavioral states of the animals or adjustments to photoperiodicity, temperature and postural states of the animals (Sanwal et al 1974).…”

Section: Discussionsupporting

confidence: 81%

“…Dyrmundsson (1973) reported that supplementation enhanced the ability of lambs to reach puberty and the results from the present study substantiate his observations. Bodyweight, scrotal circumference and testosterone concentrations have all been observed to increase with age in bulls (Karg et al 1976;Lunstra et al 1978;Rekwot et al 1987). The observation in the present study that testosterone concentrations increased gradually as the bucks approached puberty supports the hypothalamic desensitization theory of sexual maturation (Odell & Swedloff 1974;Lacroix & Pelletier 1979).…”

Section: Discussionsupporting

confidence: 74%

“…The effect of improving protein intake on age at onset of puberty in Zebu bulls under range conditions has been reported (Oyedipe et al . 1981;Rekwot et al . 1987).…”

Section: Introductionmentioning

confidence: 99%

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Scrotal circumference, bodyweight and serum testosterone concentration of Red Sokoto weaner bucks as influenced by dry season crop‐residue supplementation

Malau‐Aduli¹,

Eduvie

Lakpini

et al. 2003

Animal Science Journal

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The effect of dry season supplementation with crop-residue-based rations on bodyweight, scrotal circumference and serum testosterone concentrations in Red Sokoto weaner bucks at 5, 6 and 7 months of age was investigated in the present study. There were 7 treatment groups which were fed a positive control ration (conventional concentrate) fed at 1 and 2% of the bucks' bodyweights (Rations 1A and 2A), two crop-residue-based test rations each fed at 1 and 2% of bodyweight (1B, 2B, 1C and 2C), and a negative control that was unsupplemented (Ration D). All treatment groups had ad libitum access to natural pastures and Digitaria smutsii hay as a basal diet. Bodyweight and scrotal circumference of the bucks significantly increased ( P < 0.05) with age from 5.9 kg to 10.2 kg, and 4.40 cm to 6.95 cm, at 5 and 7 months of age, respectively. Bucks on Ration D (unsupplemented group) had the lowest bodyweight and scrotal circumference. Bucks on Ration 2A showed a significant increase in basal testosterone concentration from 0.32 ng/mL at 5 months of age to 0.65 ng/mL at 7 months of age. Peak testosterone concentration also increased from 1.0 ng/mL at 5 months to 2.8 ng/mL at 7 months of age. Bucks on test Ration 2C had higher bodyweights (6.75, 8.00 and 10.00 kg at 5, 6 and 7 months of age, respectively) than bucks on the other test Ration B (6.20, 7.20 and 8.50 kg, respectively). There were no significant differences between the two test rations with regard to scrotal circumferences of the bucks at all ages. However, at 7 months of age, bucks on test Ration 2C had significantly higher peak testosterone concentration (1.80 ng/mL) than their counterparts on test Ration 2B (1.30 ng/mL). The secretory patterns of testosterone were episodic and pulsatile in nature. It was concluded that crop-residue supplementation in prepubertal Red Sokoto bucks has a significant influence on their bodyweight, scrotal circumference and testosterone production. Test Ration C was a cheap, affordable and better crop-residue-based ration for optimal reproductive performance than test Ration B.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionsupporting

confidence: 81%

Section: Discussionsupporting

confidence: 74%

“…The effect of improving protein intake on age at onset of puberty in Zebu bulls under range conditions has been reported (Oyedipe et al . 1981;Rekwot et al . 1987).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Scrotal circumference, bodyweight and serum testosterone concentration of Red Sokoto weaner bucks as influenced by dry season crop‐residue supplementation

Malau‐Aduli¹,

Eduvie

Lakpini

et al. 2003

Animal Science Journal

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“…Esses fatos são característicos da fase puberal de touros das raças taurinas e zebuínas em desenvolvimento reprodutivo, tanto em ambientes tropicais quanto temperados (Lunstra et al, 1978;Rekwot et al, 1987;Madrid et al, 1988;Freneau, 1991). Essas correlações perdem valor e/ou significância, em estudos que caracterizam animais adultos, com mais de três anos de idade (Salisbury et al, 1978). Observaram-se coeficientes de correlação elevados e negativos entre as características de aspectos físicos e morfológicos dos ejaculados.…”

Section: Resultsunclassified

Puberdade em touros Nelore criados em pasto no Brasil: características corporais, testiculares e seminais e de índice de capacidade andrológica por pontos

Freneau

Filho²,

Marques³

et al. 2006

Arq. Bras. Med. Vet. Zootec.

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RESUMOForam utilizados 23 touros da raça Nelore entre os 10 e 20 meses de idade, para caracterizar o desenvolvimento puberal. Os animais foram criados em condições extensivas com alimentação em pasto e suplementação mineral. A cada duas ou quatro semanas foram realizadas colheitas de dados que incluíram medidas de peso corporal, circunferência torácica, comprimento e largura testicular e circunferência escrotal. Foram, também, colhidos ejaculados pela eletroejaculação e avaliados os aspectos físicos e morfológicos. No momento da colheita de sêmen foram aferidas as porcentagens de desprendimento entre pênis e prepúcio e determinadas as idades médias ao desprendimento total (IDPPRE). Foram determinadas as idades médias ao aparecimento dos primeiros espermatozóides (ISEM1) e dos primeiros espermatozóides móveis (ISEM2) no ejaculado, e a puberdade seminal (IDPUB). Estabeleceram-se os índices de capacidade andrológica por pontos (ICAP). Os touros Nelore apresentaram idades médias ISEM1, ISEM2 e IDPUB de 13,1±2,2, 13,6±2,3 e 14,8±1,8 meses, respectivamente, e IDPPRE de 18,1±1,9. Aos 16 meses de idade, o grupo apresentou 91,4%, 82,6% e 73,9% dos animais com ISEM1, ISEM2 e IDPUB manifestada, respectivamente. Observou-se correlação positiva entre idade dos touros e as características de crescimento corporal, testicular, aspectos físicos dos ejaculados e correlação negativa entre a idade dos touros e os defeitos espermáticos. Observou-se correlação negativa entre a idade dos touros e a pontuação para circunferência escrotal no ICAP à puberdade (-0,77; P<0,001). Touros da raça Nelore, criados a pastos, manifestaram a puberdade precocemente antes dos 15 meses de idade. Houve um período de 51 dias desde o aparecimento dos espermatozóides no ejaculado, até a puberdade seminal. A puberdade foi mais precoce nos touros jovens com maiores testículos.Palavras-chave: bovino, Nelore, puberdade, testículo, sêmen, circunferência escrotal ABSTRACT

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Gonadal and extragonadal sperm reserves in Boran and Boran × Friesian bulls raised on two planes of nutrition in the Highlands of Ethiopia

Tegegne¹,

Dembarga

Kassa

1992

Theriogenology

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The effect of protein intake on the onset of puberty in Bunaji and Friesian × Bunaji crossbred bulls in Nigeria

Cited by 19 publications

References 12 publications

Scrotal circumference, bodyweight and serum testosterone concentration of Red Sokoto weaner bucks as influenced by dry season crop‐residue supplementation

Scrotal circumference, bodyweight and serum testosterone concentration of Red Sokoto weaner bucks as influenced by dry season crop‐residue supplementation

Puberdade em touros Nelore criados em pasto no Brasil: características corporais, testiculares e seminais e de índice de capacidade andrológica por pontos

Gonadal and extragonadal sperm reserves in Boran and Boran × Friesian bulls raised on two planes of nutrition in the Highlands of Ethiopia

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