Vitellogenin dynamics and its relationships with laying traits of Philippine Mallard (Anas platyrhynchos domesticus Linn.) / Arnolfo Marquez Monleon ; Angel L. Lambio, chair, advisory committee.

Date

4-2011

Abstract

The vitellogenin (Vtg) dynamics were determined at 17 to 22 weeks of age, at sexual maturity, and at 40 week of age of Philippine Mallard (Anas platyrhynchos domesticus Linn.). The relationship of Vtg concentration ([Vtg], µg Zn per dL) at these ages were evaluated with laying traits from lay of first egg until 40 weeks of age. The influence of temperature and humidity on selected laying traits from lay of first egg until 40 weeks of age. The influence of temperature and humidity on selected laying traits was evaluated also as an indirect measure of environment effect on Vtg. A total of 340 ducks aged 12 week old were randomly selected, raised singly in a cage, and fed ration with or without 30 ppm supplemental zinc in RCBD. Blood serum samples were collected from all experimental ducks and assayed for Vtg. Measures of selected reproductive parameters were obtained from ducks processed at specified age. The egg production records were collected daily and analyzed for relationship with [Vtg]. Data were statistically tested using PROC, GLM, PROC CORR, PRC REG, and OROC NESTED. Results showed that the circulating Vtg in blood serum of ducks at 17 to 22 weeks of age, at sexual maturity, and at 40 weeks of age were 0.65±0.10 µg Zn per dL, 0.69±0.07 µg Zn per dL, and 1,80±1.47 µg Zn per dL, respectively. The significant trend in [Vtg] at 17 tp 22 weeks of age was a quadratic function. On the other hand, changes in [Vtg] in three reproductive periods: at17 to 22 weeks of age, at sexual maturity, and at 40 weeks of age were a cubic function. There is a significant relationship of Vtg at 17 to 22 weeks og age with body weight and liver weight. Vtg at sexual maturity had no relation with laying traits. At 40 weeks of age, high circulating Vtg was positively correlated with early maturity, large body weight, longer laying duration and pause length, and lower hen-day rate egg production. The low circulating Vtg was observed in late maturing, smaller body weight, shorter laying duration and pause length, and higher hen0day rate egg production. There is a significant relationship of temperature with total eggs produced, hen-day rate egg production, and occurrence of soft shelled eggs, shell-less eggs and double-yolked eggs. The relative humidity and temperature humidity index did not influence the laying traits. Results of these studies showed that the circulating Vtg follows a dynamic pattern common in all organisms depending on biochemical, physiological, and metabolic requirements and utilization. The serum profiles of Vtg can be used as nonlethal physiological indices of reproductive state and laying performance of Philippine Mallard.

Document Type

Dissertation

Degree

Doctor of Philosophy in Animal Science

College

Graduate School (GS)

Adviser/Committee Chair

Angel L. Lambio

Committee Member

Angel L. Lambio, Carmelita M. Rebancos, Renato SA. Vega, Severino S. Capitan

Language

English

LC Subject

Vitellogenins, Mallard, Animal science Animal and Dairy Sciences Cluster

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 996 2011 A5 M66

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