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Genetic parameters for milk yield and reproduction traits in the Chilean Dairy Overo Colorado cattle breed Ciencia e Investigación Agraria
Montaldo,Hugo H; Trejo,Carlos; Lizana,Carlos.
The objective of this study was to estimate genetic parameters for milk production and reproduction traits using phenotypic and pedigree information from the Dairy Overo Colorado breed from southern Chile. Single- and multi-trait mixed models were used to analyze the data. Analyses were performed using ASReml software. The heritability estimates for milk yield, fat yield, protein yield, fat content, protein content, age at first calving and calving interval were 0.29 ± 0.04, 0.34 ± 0.04, 0.30 ± 0.04, 0.56 ± 0.04, 0.56 ± 0.04, 0.01 ± 0.07 and 0.002 ± 0.02, respectively. The genetic correlations between yield traits were high and positive (≥ 0.81). The genetic correlations of milk yield with fat content (-0.32) and protein content (-0.34) were...
Tipo: Journal article Palavras-chave: Breeding; Chile; Correlation; Heritability; Local cattle breed.
Ano: 2017 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100003
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Seed germination of Agave species as influenced by substrate water potential Biol. Res.
Ramírez-Tobías,Hugo M; Peña-Valdivia,Cecilia B; Trejo,Carlos; R,J Rogelio Aguirre; Humberto Vaquera,H.
BACKGROUND: Plants of Agave spp. perform Crassulacean acid metabolism (CAM) and are highly drought-tolerant, but little is known concerning seed germination under low water availability. The aim of this study was to assess the effect of substrate water potential (ΨW) on seed germination and contrast hydrotime parameters of seven valuable and commercially-important Agave species from different geographical distributions and climatic regions of Mexico. Our hypothesis was that seed germination of Agave species is not affected by low water availability independently of seed biomass and the climate of their distribution area. RESULTS: Seed germination (at 25°C and in the dark) between 85 and 100% for all species occurred within 80 - 180 h at -0.03 MPa...
Tipo: Journal article Palavras-chave: Base water potential; CAM; Drought; Germination; Hydrotime model; Maguey.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602014000100011
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