The objective of the study was to evaluate two methods of detection of oestrus in two seasons and their influence on reproductive efficiency in Holstein cows. A total of 1445 records was evaluated from an intensive commercial farm located in the north of Lima, Peru in 2014. The methods of detection of oestrus were a commercial activity meter (T1), visual observation (T2) and the combination of both methods (T3). The reproductive parameters evaluated were the rate of heat detection,  conception rate, number of services per conception, open days and parity number. The highest number of heats was detected with T3 (52.2%) compared to 27.5% of T1 and 20.2% of T2 (p<0.05). T1 was more efficient in detecting heats during the summer (34.7% heats) compared to T2 (13.2%) (p<0.05). T1 showed a higher number of heats in the first and second lactations (30.3 and 26.5%, respectively) compared t...

El objetivo del estudio fue evaluar dos métodos de detección del celo en dos épocas del año y su influencia sobre la eficiencia reproductiva de vacas Holstein. Se evaluaron 1445 registros de un establo comercial de explotación intensiva ubicada en el norte de Lima, Perú en 2014. Los métodos de detección de celo fueron un medidor de actividad comercial (T1), la observación visual (T2) y la combinación de ambos métodos (T3). Los parámetros reproductivos evaluados fueron la tasa de detección de celos, la tasa de concepción, el número de servicios por concepción, los días abiertos y el número de parto. El mayor número de celos fue detectado con T3 (52.2%) en comparación al 27.5% de T1 y al 20.2% de T2 (p<0.05). T1 fue más eficiente en la detección de celos durante el verano (34.7% de celos) en comparación con T2 (13.2%) (p<0.05). T1 detectó mayor número de celo...

The improvement of the Agricultural Production Units (UPA) in Ecuador depends on the knowledge of the needs of the farmers for the approach of suitable alternatives and technology transfer. The aim of this study was to identify the components of the double-purpose cattle production system in two cantons of the Zamora Chinchipe province. Thirty farmers were interviewed from the Nangaritza canton and 65 from Palanda, with a questionnaire that considered social, technical and economic aspects. In both cantons family labour predominates and most own the land. Moreover, 53 and 73% of the UPAs of Nangaritza and Palanda, respectively, have between 5 and 50 ha, where they mainly cultivate Merkeron grass (Setaria sphacelata). The average number of heads per UPS is 43 and 37 in the cantons of Nangaritza and Palanda, respectively. In the economic aspect, the livestock products are sold outside the ...

Universidad Nacional Agraria La Molina. Escuela de Posgrado. Maestría en Producción Animal

The aim of the study was to analyze the influence of the egg disinfection method and breeder age on incubation parameters in a turkey breeder farm. Two disinfection methods were evaluated: T1, fumigation with formaldehyde gas (8 g/m3) and T2, wetting with a glutaraldehyde + quaternary ammonium solution (4 ml/l of water), which were applied to hatching eggs from two batches of B.U.T breed turkeys from 51 to 57 weeks of age. A completely randomized block design with a 2x7 factorial arrangement was used. Hatchability, birth, mortality and discard parameters were determined. The disinfection method influenced the culling of hatched poults (p<0.05), where T1 achieved less culling (3%) compared to T2 (3.8%). No significant differences were observed in hatchability, births and mortality between disinfection methods. The increase in the age of the breeder generated a significant decrease (p&l...