Weight and age at puberty and their correlations with morphometric measurements in crossbred breed Suffolk ewe lambs

Weight and age at puberty and their correlations with morphometric measurements in crossbred breed Suffolk ewe lambs

The objective of this study was to identify and to correlate parameters that characterize puberty and estimate the age and weight of Suffolk ewe lambs in Mato Grosso do Sul. This study was carried out with twenty-two Suffolk ewe lambs for 256 days. Blood samples were collected from the jugular vein...

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Published in:Revista brasileira de zootecnia Vol. 39; no. 1; pp. 134 - 141
Main Authors: Ferra, Janine de Campos(Universidade Federal de Mato Grosso do Sul), Cieslak, Silvia(Universidade Federal de Mato Grosso do Sul), Sartori Filho, Roberto(Embrapa Recursos Genéticos e Biotecnologia), McManus, Connie(Universidade de Brasília), Martins, Carlos Frederico(Embrapa Cerrados), Sereno, José Robson Bezerra(Embrapa Cerrados)
Format: Journal Article
Language:English
Published: Sociedade Brasileira de Zootecnia 2010
Subjects:
AGRICULTURE, DAIRY & ANIMAL SCIENCE
chest perimeter
ovinos
perímetro torácico
progesterona
progesterone
radioimmnunoassay
radioimunoensaio
sheep
VETERINARY SCIENCES
chest perimeter
perímetro torácico
progesterona
progesterone
ovinos
radioimmnunoassay
radioimunoensaio
sheep
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Summary:The objective of this study was to identify and to correlate parameters that characterize puberty and estimate the age and weight of Suffolk ewe lambs in Mato Grosso do Sul. This study was carried out with twenty-two Suffolk ewe lambs for 256 days. Blood samples were collected from the jugular vein and centrifugated and the plasma were stored at -20°C until analysis of progesterone (P4) concentration by radioimmunoassay (RIA). The morphometric measurements included: head length and width, body length, elbow height, chest perimeter, back-sternal diameter, croup length, width and height, cannon bone perimeter and shoulder and hip width, using a tape. The animals became pubertal when the plasma progesterone concentration was >1.0 ng/mL, at 34.1 ± 5.2 kg and 39.5 ± 8.5 weeks of age. Meanwhile, the lambs that did not reach puberty (37.7 ± 11.4 weeks of age) were lighter. The morphometric measurements has medium to low correlations with age and weight at puberty. Os objetivos neste trabalho foram identificar e correlacionar parâmetros que caracterizem a puberdade e estimar a idade e o peso à puberdade de cordeiras mestiças Suffolk. Amostras de sangue de 22 borregas foram coletadas e centrifugadas e o plasma armazenado a -20 ºC para posterior análise das concentrações de progesterona (P4) por meio de radioimunoensaio. As medidas morfométricas aferidas foram: comprimento e largura da cabeça; comprimento do corpo; altura de cernelha; perímetro torácico; diâmetro dorso-esternal; comprimento, altura e largura de garupa; perímetro de canela; e largura entre ísquios e ílios, utilizando-se fita métrica. Definiu-se como início da puberdade quando os animais apresentaram concentração plasmática de P4 >1,0 ng/mL, o que ocorreu aos 34,1 ± 5,2 kg de peso vivo e 39,5 ± 8,5 semanas de idade. Entretanto, as cordeiras que não atingiram a puberdade (37,7 ± 11,4 semanas de idade) apresentaram peso menor. As medidas morfométricas apresentam médias e baixas correlações com idade e peso à puberdade.
Bibliography:http://www.scielo.br/scielo.php?pid=S1516-35982010000100018&script=sci_abstract&tlng=pt
ISSN:1516-3598
1806-9290
1806-9290
1516-3598
DOI:10.1590/S1516-35982010000100018