Relationship of testicular growth and size to age, body weight and onset of puberty in Menz ram lambs

Mukasa-Mugerwa, E.; Ezaz, Zere

doi:10.1016/0093-691x(92)90172-n

Cited by 59 publications

(46 citation statements)

References 11 publications

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“…The study revealed that the age at onset of puberty in our indigenous rams is similar to other studied [20]. The mean age and body weight at puberty is comparatively lower but BCS is higher than the findings of Mukasa-Mugerwa and Ezaz [15]. However, the similar condition score (3.3±0.4) was observed [14] for yearling rams.…”

Section: Age Weight Bcs and Scrotal Circumference At Pubertysupporting

confidence: 46%

“…The overall mean scrotal circumference was recorded 32.0±1.2cm [3]. The mean growth rate of live weight and scrotal circumference of our indigenous rams were also lower than reported by other [15]. This discrimination of body weight [11] and scrotal circumference may be differed depending on different breeds [16], Feeding practice affect the scrotal circumference and scrotal growth rate in ram lambs (p<0.001) [17].…”

Section: Discussionmentioning

confidence: 98%

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Baseline Study of Reproductive Performances of Indigenous Rams in Bangladesh

nesa¹,

Zohara²,

Bari³

et al. 2014

IOSRJAVS

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10.0±0.4(kg), 3.2±0.1, 18.6±0.7(cm), respectively. The volume, density, mass motility, concentration were 1.2±0.0ml, 2.9±0.0, 4.3±0.0 and 4.1±0.7x10 9 , respectively. The rate of motility: 89. 0±0.2, 72.4±0.2, 62.0±0.6, viability: 91.8±0.1, 75.6±0.2, 64.8±0.6, functional integrity: 87.3±0.2, 69.1±0.2, 50.2±0.5 and normal spermatozoa were 94.0±0.1, 77.3±0.1 and 75.0±0.2 in fresh, chilled and frozen semen, respectively.

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Section: Age Weight Bcs and Scrotal Circumference At Pubertysupporting

confidence: 46%

Section: Discussionmentioning

confidence: 98%

Baseline Study of Reproductive Performances of Indigenous Rams in Bangladesh

nesa¹,

Zohara²,

Bari³

et al. 2014

IOSRJAVS

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“…Segundo Figueiró e Benavides (1990) cordeiros geralmente ganham mais peso do que cordeiras, e quanto mais velhos os animais, maior a diferença. Esta diferença tem a ver com a maior produção de hormônios sexuais (andrógenos) pelos testículos após a puberdade dos animais, o que ocorre normalmente entre 6 a 9 meses de idade, fase influenciada pelo genótipo do animal, fotoperíodo, temperatura, nutrição e condição corporal (MUKASA-MUGERWA; EZAZ, 1992;CASTRILLEJO et al, 1995;PRICE;BORGWARDT;DALLY, 1995). Carvalho et al (1997) não observaram diferenças no peso e no ganho de peso de cordeiros e cordeiras até os 100 dias de idade.…”

Section: Resultsunclassified

Desempenho de cordeiros desmamados aos 67 dias alimentados com silagem de milho e feno de aveia

et al. 2003

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ResumoEste trabalho teve como objetivo avaliar o desempenho de cordeiros desmamados aos 67 dias e alimentados com diferentes fontes de volumosos em confinamento. Foram utilizados 30 animais oriundos de cruzamentos entre ovelhas Corriedale e carneiros Hampshire Down, Ile de France e Suffolk. Logo após o desmame os animais foram confinados, sendo distribuídos para receberem um dos tratamentos: T1 -Silagem de milho mais concentrado; T2 -Silagem de milho e feno de aveia (50% do volumoso cada) mais concentrado; e T3 -Feno de aveia mais concentrado. A proporção volumoso:concentrado utilizada foi de 60:40, base seca. Os pesos médios dos animais no início do experimento foram de 11,51; 12,46 e 12,33 kg (P>0,05) e os pesos finais, após nove semanas de confinamento, de 17,53; 19,34 e 19,35 kg (P>0,05), respectivamente, para T1, T2 e T3. Os animais apresentaram ganho de peso similar (P>0,05) entre os tratamentos. Não foram observadas diferenças para os pesos e ganhos de peso entre grupos raciais, porém, os machos apresentaram maiores ganhos de peso do que as fêmeas (0,120 x 0,091 kg/dia). Não houve diferença para a conversão alimentar entre os tratamentos, porém animais do T2 consumiram maior quantidade de matéria seca. Os resultados obtidos neste estudo sugerem que pode ser utilizado tanto a silagem de milho como o feno de aveia na alimentação de cordeiros desmamados, sem prejuízos na produção. Palavras-chave: Confinamento, ganho de peso, grupo genético, ovinos, volumoso. AbstractThis work had as objectives to evaluate the performance of lambs weaned at 67 days of age and fed with different roughage sources in confinement. Thirty animals out of Corriedale ewes mated to Hampshire Down, Ile de France and Suffolk rams, were used. After weaning the animals were fedlot and distributed in one of the following treatments: T1 -Corn silage + concentrate; T2 -Corn silage and oat hay (50% each) + concentrate; and T3 -Oat hay + concentrate. It was used a 60:40 roughage:concentrate ratio, dry matter basis. At the beginning of the experiment the animals weighed 11. 51, 12.46 and 12.33 kg (P>0.05), and after nine weeks of feedlot the weights were 17. 53, 19.34 and 19.35 kg (P>0.05), respectively, for T1, T2 e T3. Average daily weight gain was similar (P>0.05) among treatments. It was not observed differences (P>0.05) in weights and weight gains among the genetic groups. However, male lambs presented greater average daily weight gain than female lambs (0.120 x 0.091 kg). There were no differences in feed conversion among the treatments, however, animals from the T2 had greater dry matter intake. It can be concluded that either corn silage or oat hay can be used for feeding weaned lambs.

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“…Long-or short-term nutritional manipulation affects testicular growth, activity and sperm production (Oldham et al, 1978). Under an extensive system of management, the level of nutrition has a more severe impact on ram reproduction than the photoperiod (Mukasa-Mugerva and Ezaz, 1992;Perez et al, 1997). In this management system, lack of adequate year-round feed resources is probably major factor in low animal production in arid and semi-arid regions in the world (Ben Salem and Smith, 2008;Kawas et al, 2010).…”

Section: Introductionmentioning

confidence: 99%