Investigação

Início / Investigação / Apresentações / Body composition and growth of Alentejano and crossbreed (Large-White X Landrace) piglets.

Body composition and growth of Alentejano and crossbreed (Large-White X Landrace) piglets.

Ano
2004
Abstract

This work aims at comparing performance of piglets of alentejano breed (AL) to that of crossbred (LW x LWxLR) piglets (C) in terms of survival, growth and body composition. This study included 7 litters of each genotype. Five piglets from each genotype were slaughtered at birth, before nursing, and chemical composition of carcasses was determined. Three to four piglets, aged 24-48 hours, were cross fostered to sows of the other genotype. Colostrum and milk samples were collected during farrowing and 24 hours later, and at day 5, 15 and 21 of lactation, respectively. Rectal temperature was determined at birth, 30 minutes and 24 hours of age of each piglet. Blood samples were collected at birth from umbilical cord and plasma levels of IGF-1 were determined. Piglets were weighed at birth then at 1, 5, 10, 15 and 21 days of age. At 21 days of age, 6 piglets of each genotype (3 of them being adopted) were slaughtered and had their chemical composition of carcasses determined. The reproductive performance was not significantly different between genotypes. Regarding colostrum and milk composition, colostrum from AL sows had higher (p<0.05) levels of protein (at farrowing) and lipids (at 24 hours) than colostrum from LWxLR sows. There was no significant effect of genotype on milk composition. At birth, C piglets were heavier (p<0.05) and had higher rectal temperature (p<0.01) than AL piglets, but not thereafter. The initial rectal temperature drop (birth -30 minutes) was independent of genotype but was inversely correlated (r= -0.56; p< 0.001) to birth weight. Survival (birth-5 days) was related to birth weight and the initial rectal temperature drop. Plasma IGF-1 levels intra-genotype and intra-litter were directly correlated (r=0.39) with birth weight. At birth, carcasses from AL piglets had higher dry matter (p<0.01), crude protein (p<0.05) and total lipids (p<0.07) contents than carcasses from C piglets but liver glycogen content was similar in both genotypes. Growth of piglets between birth and 21 days was independent of piglet genotype and of that of the suckling sow. It was correlated with weight at 24 hours (p<0.01). At 21 days, carcasses of AL piglets nursed by AL or LWxLR sows had significantly higher content of lipids (p<0,01) than C carcasses. Results show that, from the suckling period, AL piglets seem to have a higher propensity to deposit fat than piglets from modern genotype. Studies involving a larger number of animals are required to confirm present results.

Palavras Chave

Swine; Alentejano breed; Piglets; Body composition; Survival.

Tipo de Apresentação
Comunicação oral
Tipo de Revisão
Internacional
Âmbito Geográfico
Internacional
Situação
Publicado
Referência

Charneca, R.; Nunes, J.; Dividich, J. (2004). Body composition and growth of Alentejano and crossbreed (Large-White X Landrace) piglets. V International Symposium of the Mediterranean Pig, pp. 4. Tarbes, França.