Examinando por Autor "Muscari Greco, Juan Carmelo"

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Cruzamiento de cuy andina con hembras Merino
(Universidad Nacional Micaela Bastidas de Apurímac (UNAMBA), 2014-10-24) Higaonna Oshiro, Rosa; Muscari Greco, Juan Carmelo; Chauca Francia, Lilia Janine
Este estudio se realizó en el INIA - La Molina entre los años 2012 y 2013, para medir la habilidad combinatoria del cruzamiento Andina cuy x Merino. El tratamiento fue Merino x Merino (F0), F1 (Andina x Merino) y F2 Andina x (Andina x Merino). De 219 hembras reproductoras se registraron 1348 crías de 438 partos. Todos los animales fueron evaluados en sus pesos al nacimiento, destete a las dos semanas y controles a las 4, 8 y 13 semanas. El diseño experimental fue completamente aleatorizado con número desigual de repeticiones. Los animales se criaron en jaulas de 1,5 m2, el apareamiento fue permanente y la lactación se realizó en la misma jaula utilizando gazaperas. Todos los animales fueron alimentados con chala Zea mays como forraje y una ración equilibrada de 17% de proteína y 2,8 Mcal / kg. No se encontraron diferencias estadísticas en los pesos al nacimiento, destete, 4, 8 y 13 semanas de edad. El tamaño de camada se incrementó en un 3,7% en F1 y 9,8% en F2, F0 Merino es 2,96 número de camada.
Efecto del empadre posparto y postdestete sobre el tamaño y peso de la camada de cuyes
(Instituto Interamericano de Cooperación para la Agricultura, 1992-03-31) Chauca Francia, Lilia Janine; Zaldivar Abanto, Marco; Muscari Greco, Juan Carmelo
Postpartum breeding ia a common practice among guinea pig-producing farmers, even at the commercial level. This is possible because these animals como into heat 2-3 h postpar tum. Available evidence is not conclusive with regard to the advantages and disadvantages of this practice, when com wall with post-weaning mating. This was carried out in order to generate information that would allow for the intention of existing guinea pig production systems, under the hypothesis that breeding postpartum has no effect on litter size and weight both at birth and at weaning. Data on the first two parturitions of 300 females, at La Molina Agricultural Experimental Station, were analyzed. These females were part of a line-breeding selection program carried out at the station, of which 68.3% presented post-partum gestations and 31.7% post-weaning gestations. The four different maternal lines used made up one variable: Peru (18.3% of all females), Andina (27.7%), Inti (25.3%) and Control (ordinary stock) (28.7%). No differences in terms of mating-partum interval, nor in terms of litter size and weight, both at birth and at weaning, were detected at the first parturition. Comparisons between the selected breed lines showed that mating partum interval was shortest (P≤ 0.01) for the Andina line (81.6 ±1.89). The Andina and Control groups presented larger litters at both birth and weaning. Mating system, evaluated in the second parturition, had no effect at litter size at birth or at weaning. Average individual weight at birth was higher (P≤0.01) in offspring from post-weaning gestations (121 ± 12.43 g vs. 135 ± 3.62 g), a difference that was also noted (P≤0.05) at weaning time (P≤0.01). Partum intervals were 68 ± 0.16 and 112 ± 1.67 days in females conceiving post-partum and post-weaning, respectively. There were no effects of mating system within selected lines with respect to litter size or individual birth or weaning weights. When breed lines were compared (independent of mating system), the Peru and Inti lines showed heavier individual birth weights. Some differences were found among lines with respect to parturition intervals.