Consulta: subjectFacets:"Scrotal circumference"
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Aspectos relacionados à precocidade sexual em bovinos machos da raça Nelore, PO
Provedor de dados: 52
Autores: Silva,Antonio E. D. Feliciano; Unanian,Maria M.; Silva,Alzira Roza e.
O estudo foi desenvolvido em 79 bovinos machos da raça Nelore, PO, de dez a 16 meses de idade. Em todos os animais foram medidas a circunferência escrotal (CE), a concentração de testosterona (Testo) e o aparecimento dos primeiros espermatozoides no ejaculado. Os resultados indicaram que 18,5 % dos machos em estudo apresentaram os primeiros espermatozoides aos 306,17± 2,42 dias de idade, 19,75± 0,9 cm de circunferência escrotal, e uma concentração de testosterona de 1,57± 0,9 ng/ml. Após o aparecimento dos primeiros espermatozoides no ejaculado, os machos mostraram a puberdade aos 365,39± 1,13 dias e a maturidade aos 487,38± 3,08 dias. Estes resultados indicam que existem machos na raça Nelore, PO que iniciam a atividade sexual em idades inferiores às...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Age of first spermatozoa; Scrotal circumference; Puberty; Bovine; Nelore breed.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131999000400016

Biometric Study of the Reproductive Organs of Three Breeds of Sheep in Nigeria
Provedor de dados: 77
Autores: Ibrahim,Abdullahi Ali; Aliyu,Jibril; Ashiru,Rabi Muhammad; Jamilu,Mustapha.
A comparative study of testicular biometry was done in rams using three major breeds of sheep in Nigeria. Biometrical parameters observed were scrotal circumference (SC), testes weight (TW), testes length (TL), tunica albuginea weight (TAW), testes volume (TV), testes density (TD), epididymal weight (EW), epididymal length (EL), caput (CA), corpus (CO), cauda weight (CU), epididymal volume (EV) and epididymal density (ED). The results showed significant differences (p&lt;0.05) between the Uda, Balami and Yankasa breed in the SC, TW, TV, EW, EL, CA, CO, CU, and EV. The Uda had significantly higher (p&lt;0.05) values in most of the parameters examined than the two other breeds. A bilateral symmetry was observed for Uda and Balami in testes weight and testes...
Tipo: Journal article
Palavras-chave: Sheep; Testicular; Epididymal; Breeds; Scrotal circumference.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400053

Direct and maternal annual genetic changes for selected traits at weaning and yearling in beef cattle
Provedor de dados: 2
Autores: Boligon, Arione Augusti; Vicente, Isadora dos Santos; Roso, Vanerlei Mozaquatro; Souza, Fabio Pablos de.
Heritability and direct and maternal genetic changes were estimated in Nellore cattle for the following traits: birth to weaning weight gain (BWG), weaning to yearling weight gain (YWG), weaning conformation (WC), weaning precocity (WP), weaning muscling (WM), yearling conformation (YC), yearling precocity (YP), yearling muscling (YM) and yearling scrotal circumference (SC). Direct and maternal heritability for weaning traits were 0.21±0.03 and 0.13±0.01 (BWG); 0.19±0.03 and 0.07±0.01 (WC); 0.22±0.03 and 0.07±0.01 (WP); 0.20±0.03 and 0.07±0.01 (WM), respectively. For yearling traits, direct heritability were 0.19±0.04 (YWG); 0.32±0.05 (YC); 0.37±0.05 (YP); 0.38±0.05 (YM) and 0.41±0.04 (SC). Positive and significant direct genetic changes (p &lt; 0.05) were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic progress; Nellore cattle; Scrotal circumference; Visual scores; Weight gain.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/42572

Estimates of genetic parameters for visual scores and their correlation with production and reproductive traits in Brahman cattle
Provedor de dados: 96
Autores: Bertipaglia,Tássia Souza; Carreño,Luis Orlando Duitama; Machado,Carlos Henrique Cavallini; Andrighetto,Cristiana; Fonseca,Ricardo da.
The objective of this study was to evaluate the association of visual scores of body structure, precocity and muscularity with production (body weight at 18 months and average daily gain) and reproductive (scrotal circumference) traits in Brahman cattle in order to determine the possible use of these scores as selection criteria to improve carcass quality. Covariance components were estimated by the restricted maximum likelihood method using an animal model that included contemporary group as fixed effect. A total of 1,116 observations of body structure, precocity and muscularity were used. Heritability was 0.39, 043 and 0.40 for body structure, precocity and muscularity, respectively. The genetic correlations were 0.79 between body structure and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Average daily gain; Body weight at 18 months; Genetic correlation; Heritability; Scrotal circumference.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000600013

Genetic analyses of days to calving and their relationships with other traits in a Canchim cattle herd
Provedor de dados: 74
Autores: Mucari,Talita Buttarello; Alencar,Maurício Mello de; Barbosa,Pedro Franklin; Barbosa,Rogério Taveira.
Heritabilities and genetic correlations in a Canchim beef cattle herd were estimated using data on the following traits: male scrotal circumference at twelve months (SC12); days to first calving (DFC) for heifers; days to calving (DC) for cows; male and female weight (W) at twelve months (W12); heifer weight at the start of the first breeding season (WFBS) and at first calving (WFC); and cow weight at the start of the breeding season (WBS) and at calving (WC). Analyses of the DFC and DC traits were carried out excluding and including penalized (DFC P and DC P) non-calving females. The restricted maximum likelihood method was used, applying one-trait models for the DFC and DC analyses and two-trait models for analyses of DFC and DC combined with the other...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Body weight; Days to calving; Days to first calving; Genetic correlation; Heritability; Scrotal circumference.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572007000600007

Genetic and environmental effects on sexual precocity traits in Nellore cattle
Provedor de dados: 96
Autores: Meirelles,Sarah Laguna; Espasandin,Ana Carolina; Mattar,Maira; Queiroz,Sandra Aidar de.
The objective of this study was to estimate the heritability of probability of early pregnancy (PEP) and scrotal circumference (SC) and the genetic correlation between these traits in Nellore cattle. PEP records from 11,696 Nellore females born between 1983 and 2001 were analyzed. PEP was assumed to be one for females that effectively bred in the herd (19.84%) and zero for those discarded before first calving (80.16%). The model used to study PEP included the effects of contemporary group, age of dam at calving and heifer weaning age, direct additive genetic effects, and residual effects. For SC, 9335 records were analyzed considering the effect of contemporary group, direct additive genetic effects and residual effects. Covariance components were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beef cattle; Early pregnancy; Scrotal circumference; Threshold trait.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000800012

Measurement of scrotal circumference in beef bulls in Rio Grande do Sul
Provedor de dados: 45
Autores: Menegassi,S.R.O; Barcellos,J.O.J; Peripolli,V; Pereira,P.R.R.X; Borges,J.B.S; Lampert,V.N.
The variability of scrotal circumference and the effects of age and breed as well as the relationship between testicular weight (TW), scrotal circumference (SC), and live weight (BW) were investigated in bulls. Devon, Polled Hereford, and Red Angus breeds showed higher SC values than the other British, Continental, Synthetic, and Zebu studied breeds. The percentage of culled bulls because of low SC ranged from 7.01 to 24.25%. The increase of SC was proportional to the increase in TW and they were highly correlated (r²= 0.90). The results suggest that SC in young bulls is the best way to predict TW and, therefore, a useful tool for their selection
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fertility; Scrotal circumference; Testicular weight.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352011000100014

Reproductive success or failure in four breed groups of beef bulls
Provedor de dados: 96
Autores: Menegassi,Sílvio Renato Oliveira; Barcellos,Júlio Otávio Jardim; Peripolli,Vanessa; Dias,Eduardo Antunes; Costa Junior,João Batista Gonçalves; Vieira,Maitê de Moraes; Moojen,Fernanda Gomes.
The objective of this study was to determine the main causes of failure in bull breeding using a soundness evaluation in Rio Grande do Sul State/Brazil. We evaluated 19,836 bulls from 15 different breeds with ages ranging from two to eight years. The failures of bulls in each step were analyzed by logistic regression. The binary logistic regression was applied because the response variable had only two responses: Success (1) and Failure (0). Older bulls are more likely to be rejected than are younger bulls, regardless of their genetic group. Depending on the step of the assessment, one or another group is rejected. All steps of bull breeding soundness evaluation (BBSE) are important, with special attention to the failures of the behavioral evaluation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BBSE; Fertility; Mounting ability; Scrotal circumference.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982015000700240

Scrotal Circumference and Testicular Morphometric Characteristics of the Camel (Camelus Dromedarius) in the Semi-Arid Environment of Northern Nigeria
Provedor de dados: 77
Autores: Ali Abdullahi,Ibrahim; Al-Hassan Musa,Hassan; Jibril,Aliyu.
Reproductive tract of 12 camels (Camelus dromedarius) were used to evaluate testicular morphometry. The testicular morphometric characteristics measured were scrotal circumference (in situ), paired testis weight, epididymal weight and mean epididymal length, testis volume, and testis density. There were no significant difference (p &amp;gt;0.05) between the left and right organs, but there were numerical differences between all the parameters. A highly significant positive correlations (p &lt;0.05, p &lt;0.01, p &lt;0.001) exist between the scrotal circumference, testicular and epididymal morphometry, except for testis density which is non- significant (p &amp;gt;0.05). It was concluded that testicular morphometry would provide reliable information in...
Tipo: Journal article
Palavras-chave: Camels; Scrotal circumference; Testicular morphometry; Epididymis; Semi-arid.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000400019

Testicular and Epididymal Parameters of Sahel Buck in the Humid Zone of Nigeria
Provedor de dados: 77
Autores: Oyeyemi,M. O; Fayomi,A. P; Adeniji,D. Adejoke; Ojo,K. Mary.
The testicular and epididymal parameters of Sahel bucks in the humid zone of Nigeria was investigated. Twenty goats (30-54 months) weighing 23.48-32.03kg were used for the experiment. The scrotal circumference of the buck was measured. The bucks were then slaughtered and the testicles as well as the epididymides collected. The testicular weight, testicular diameter, testicular length and epididymal length were measured using a non-stretchable measuring tape. These parameters were correlated with one another and the values of the right testis and epididymis were compared with those of the left. The scrotal circumference was positively correlated with the testicular weight (r = 0.769, P&lt;0.01), testicular diameter (r = 0.827, P&lt;0.01), testicular length...
Tipo: Journal article
Palavras-chave: Testicular Parameter; Epididymal Parameter; Scrotal circumference; Reproduction; Sahel bucks.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200021