Artigos Científicos - INEAF

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/2787

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Interação genótipo-ambiente em rebanhos nelore da Amazônia Legal
(Universidade Federal do Pará, 2013-09) MATOS, Amanda de Sousa; SENA, Josynélia do Socorro da Silva; MARCONDES, Cíntia Righetti; LÔBO, Raysildo Barbosa; RORATO, Paulo Roberto Nogara; CUCCO, Diego de Córdova; ARAÚJO, Ronyere Olegário de; BEZERRA, Luiz Antonio Framartino
Genotype-environment interaction was studied by two different procedures in productive and reproductive traits of Nellore cattle. Data from adjusted weights at 120 (P120), 210 (P210), 450 (P450) days of age, scrotal circumference at 450 days of age (PE450) and age at first calving (IPP) for 211,744 records from Nellore herds located in the Legal Amazon region were used in the analysis. The effect of genotypeenvironment interaction was studied through heritability estimates and rank correlation, comparing the Legal Amazon animals with the general basis of animals – PMGRN Nellore Brazil. Bi-trait analyses considered P120 as anchor-trait with P210, P450 and PE450 as another one. IPP has been analyzed separately in single-trait analysis and considering GCIPP as fixed and additive and residual effects as random. Estimates of heritability for P120, P210, P450, PE450 and IPP on the data of the Legal Amazon were: 0.20 to 0.49; 0.21; 0.48; 0.45; and 0.21, respectively, and in general data of PMGRN – Nellore Brazil were: 0.23; 0.25; 0.34; 0.43 and 0.11, respectively. Correlations between rank for P120, P210, P450, PE450 and IPP were equal to 0.77; 0.79; 0.82; 0.78 and 0.38, respectively. The analysis of the genotypeenvironment interaction, through the heritability estimates, showed larger effects on maternal, weight at 450 days of age and age at first calving, whereas the rank correlations showed strong evidence in almost all traits studied.
Acesso aberto (Open Access)
Variabilidade genética do peso ao nascer e seleção para crescimento em bubalinos do estado do Pará, Brasil
(Instituto Nacional de Pesquisas da Amazônia, 2014-09) AGUIAR, Juliana Flor de; MARCONDES, Cíntia Righetti; MARQUES, José Ribamar Felipe; VOZZI, Pedro Alejandro; CAMARGO JÚNIOR, Raimundo Nonato Colares; MARQUES, Larissa Coelho; ARAÚJO, Ronyere Olegário de; GUNSKI, Ricardo José
Birth weight is a performance parameter of great zootechnical importance for both meat and dairy production, as well as for breeding animals, mainly due to its relation to survival rate at weaning, and the weight of animals throughout their developmental and growth phases. Therefore, the objective of this work was to establish heritability estimates, as well as phenotypic and genetic trends of birth weight of water buffaloes from State of Pará, Brazil. Descriptive statistics were calculated and the Shapiro-Wilk Normality test was performed with a Statistical Analysis System package. Heritability estimates were established by Bayesian inference. BW was 36.6 kg in average. The statistical model considered sex, year of birth and breed composition of the animals as fixed effects, and animal, maternal and residual as random effects. Direct heritability was platykurtic (flattened) and with higher asymmetry, presenting a bimodal distribution with the first mode close to 0.10, and the second mode close to 0.30; the maternal heritability was trimodal, with peaks very close to 0.15, and another, less evident, close to 0.20. The direct genetic trend of birth weight was negative (-0.03kg year-1) and maternal genetic trend was close to zero (0.001kg ano-1), even though the phenotypic trend had been positive (0.156 kg year-1). There is genetic variability to be addressed in a breeding program, however, very little was done as far as selection for growth of water buffaloes in the State of Pará.

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