Caracterização morfométrica de ovinos da raça Santa Inês criados nas microrregiões de Teresina e Campo Maior, Piauí

Abstract

RESUMO -Objetivou-se com esta pesquisa caracterizar fenotipicamente (peso e morfometria corporal) a conformação zootécnica de ovinos Santa Inês, machos e fêmeas de diferentes idades, criados em Teresina e Campo Maior, Piauí. Foram utilizados dados de pesos e de medidas corporais de 1.113 animais criados a campo e de 824 animais que participaram de exposição em feira agropecuária de Teresina. As características estudadas, comparadas pelo teste de Student-Newman-Keuls, foram: peso do animal, altura na cernelha e na garupa, comprimento corporal e de garupa, perímetro torácico e dois índices indicadores de capacidade corporal do animal. O efeito do manejo mostrou-se uma importante fonte de variação nas características avaliadas e o dimorfismo sexual foi mais acentuado nos animais mais velhos. O peso corporal foi mais influenciado pelos efeitos considerados nas análises que as demais medidas morfométricas. O índice que relaciona o peso ao comprimento corporal evidenciou que a tendência de acúmulo de gordura nos machos adultos é maior que nas fêmeas. O peso e as medidas morfométricas avaliadas apresentaram-se positivamente correlacionados, indicando a possibilidade de respostas correlacionadas se utilizados em programa de seleção da raça.Palavras-chave: correlação, índice corporal, morfometria corporal, peso, tamanho Morphometric characterization of Santa Inês sheep raised in the regions of Teresina and Campo Maior, PiauíABSTRACT -This study aimed to carry out the phenotypic characterization of males and females of Santa Inês hair sheep through body weight measurements and morphmetric and conformation evaluations at different ages. Data consisted of body weights and measurements from 1,113 animals raised in Teresina and Campo Maior regions of Piauí State under pasture regime and 824 animals that participated in Agricultural Fairs in Teresina. Adjusted means for body weight, withers and croup height, corporal and croup length, thoracic perimeter and two indexes of body capacity of the animal were compared by the Student-Newman-Keuls test. The management effect was an important source of variation for the evaluated traits and the sexual dimorphism was more accentuated in the oldest animals. The effects included in the model influenced more the body weights than the morph metric measurements. The index of body capacity (weight and length) indicated a trend for more accumulation of fat in oldest males than in females. The body weight and the morphmetric measurements were positively correlated indicating the possibility of correlated response in breeding programs for the Santa Inês breed.Key Words: body index, correlation, morphmetric, size, weight IntroduçãoNas regiões tropicais, tem-se procurado a melhoria da produtividade dos ovinos por meio da forma que parece ser a mais simples: a introdução de raças com bom desempenho em outras regiões (Sousa & Morais, 2000). No entanto, a viabilidade desse procedimento não tem sido investigada e, como agravante, a conformação corporal dos descendentes de animais importados, especifi...

Performance and carcass traits of Santa Inês lambs finished with different sources of forage

“…Medium positive correlations were found between the biometric measurements and between these measures and body weight. This is in agreement with results obtained in sheep and cattle by , Rocha et al (2003) andCosta Júnior et al (2006). The correlation between RW and days on treatment was negative (-0.43), showing that this decreased with time, probably due to the use of fat for growth.…”

“…Costa Júnior et al (2006) found differences in rump width (19.6±2.4 cm), which was 6% higher in males. Cunha et al (2000), in an experiment with Santa Ines lambs slaughtered at 32 kg, found a hip width of 19.1 cm.…”

“…These changes may be due to differences in the production of volatile fatty acids in the diets, resulting in hyperplasia and hypertrophy of cellular organelles (Cullen & MacLachlan, 2001). Moreover, it may be a result of waste and active ingredients of pesticides used in this crop and the grace period, factors that could cause an increased intracellular accumulation of glycogen and/or lipids, leading to an increase in volume and weight of the liver.…”

Influence of environmental factors on ponderal performance and morphometric characteristics of lambs of different genetic groups from birth to weaning

“…Morphometric measurements were performed with the help of a tape measure, with the animal standing correctly on its feet and legs, in agreement with the methodology described by Costa Júnior et al (2006). The following morphometric measurements were recorded: height, measured between the highest point of the interscapular region (withers) and the ground; body length, measured from wither to the tail insertion; and heart girth, measured on the external circumference of the thoracic cavity, on the axillae.…”

Identification of polymorphisms in the myostatin and leptin genes of santa inês breed and crossbreed sheep and association with carcass traits

“…The Santa Ines is the most popular local breed of Brazil characterized by high adaptive value, reproductive, resistance to gastrointestinal parasites in addition to a good weight development in the tropics (COSTA JÚNIOR et al, 2006). It has been used as maternal lineage at the crossing with specialized breeds in meat production by is adapted the climatic conditions in the tropics.…”