Effect of breeder age on eggshell thickness, surface temperature, hatchability and chick weigh

Two experiments were carried out to study the effect of breeder age on incubation parameters (hatchability, eggshell thickness, egg surface temperature and chick weight). In Exp. 1, fertile eggs (30- and 60-wk-old breeders) were incubated at three different temperatures (36.8, 37.8 and 38.8 ºC). Eggshell surface temperature was measured by attaching a thermocouple to the shell and data were collected in a datalogger every ten minutes. This study was conducted according to a 3 x 2 factorial design (three temperatures and two breeder ages). Data revealed that eggshell surface temperature changed according to incubation temperature, with the main increase occurring between 10 and 13 days of incubation, and that the maximum increase in eggshell surface temperature was not higher than +0.6 ºC, irrespective of incubator temperature. The incubator temperature affected total incubation period and hatchability (%) at 38.8 ºC, independent of breeder age. Heavier eggs resulted in heavier chicks, irrespective of incubator temperature. In Exp 2, the eggs (30- and 60-wk-old breeders) were incubated at 37.8 ºC and eggs characteristics (weight, specific gravity, total hatchability and chicks weight) were evaluated according to a randomized experimental design. The data showed that breeder age affected eggshell thickness and chick weight (heavier eggs resulted in heavier chicks), but not specific gravity, eggshell surface temperature or hatchability. The findings of this study revealed that hatchability can be influenced by incubation temperature, but not by the breeder age. Breeder age can affect eggshell thickness, egg weight and eggshell surface temperature, but not specific gravity

Effect of breeder age on eggshell thickness, surface temperature, hatchability and chick weigh

Two experiments were carried out to study the effect of breeder age on incubation parameters (hatchability, eggshell thickness, egg surface temperature and chick weight). In Exp. 1, fertile eggs (30- and 60-wk-old breeders) were incubated at three different temperatures (36.8, 37.8 and 38.8 ºC). Eggshell surface temperature was measured by attaching a thermocouple to the shell and data were collected in a datalogger every ten minutes. This study was conducted according to a 3 x 2 factorial design (three temperatures and two breeder ages). Data revealed that eggshell surface temperature changed according to incubation temperature, with the main increase occurring between 10 and 13 days of incubation, and that the maximum increase in eggshell surface temperature was not higher than +0.6 ºC, irrespective of incubator temperature. The incubator temperature affected total incubation period and hatchability (%) at 38.8 ºC, independent of breeder age. Heavier eggs resulted in heavier chicks, irrespective of incubator temperature. In Exp 2, the eggs (30- and 60-wk-old breeders) were incubated at 37.8 ºC and eggs characteristics (weight, specific gravity, total hatchability and chicks weight) were evaluated according to a randomized experimental design. The data showed that breeder age affected eggshell thickness and chick weight (heavier eggs resulted in heavier chicks), but not specific gravity, eggshell surface temperature or hatchability. The findings of this study revealed that hatchability can be influenced by incubation temperature, but not by the breeder age. Breeder age can affect eggshell thickness, egg weight and eggshell surface temperature, but not specific gravity

CALIDAD SEMINAL DEL PEZ PIRACANJUBA (BRYCON ORBIGNYANUS) POST-DESCONGELACIÓN

One experiment was conducted in Environment Center of Energy Company of Minas Gerais-Brazil and in the Physiology and Pharmacology Laboratory of Veterinary Medicine Department of Lavras University (UFLA) in order to evaluate the effect of two extenders (Glucose 5% and Coconut water) in the freezing semen of Piracanjuba (Brycon orbignyanus). In the present study were used Sodium bicarbonate 0.5 and 1,0% and destilated water to activate sperm motility. An factorial 2 X 3 was used for test the effect of two extenders for freezing semen and three sperm motility activator in post-freezing semen. The sperm motility post-freezing was 60% in Coconut water and was observed significative effect (P0.01) in the two extenders used but was higher when Sodium bicarbonate activator was used. The Coconut water used as extender of freezing semen and Sodium bicarbonate used as sperm motility activator post-freezing semen increase and extend, respectively the sperm motility in Piracanjuba freezing semen.Este experimento fue realizado en la Unidad Ambiental de la Compañía Energética de Minas Gerais-Brasil y en el Laboratorio de Fisiología y Farmacología del Departamento de Medicina Veterinaria de la Universidad Federal de Lavras (UFLA). El objetivo del trabajo fue evaluar el efecto de dos diluyentes (Glucosa 5% y agua de coco) en el semen del pez Piracanjuba (Brycon orbignyanus) después de congelado. Fueron utilizados como activadores de la motilidad espermática después de congelación el bicarbonato sódico al 0,5 y 1,0 % y agua destilada. Un modelo factorial de 2 x 3 fue utilizado para testar el efecto de los diluyentes de congelación y de los activadores de la motilidad espermática después de la congelación. La motilidad espermática media fue de 60% cuando se utilizó el agua de coco como diluyente, observándose diferencia significativa (P0,01) entre los diluyentes utilizados pero fue mejor (

Hematological values and body, heart and liver weights of male and female broiler embryos of young and old breeder eggs

This study analyzed broiler breeder age (29 or 60 wk-old) effects on physical characteristics of eggs (initial mass, mass loss, volume, diameter, surface area and density) and of eggshells(weight, volume, thickness, conductance, and porosity ), as well as the influence of embryo sex on hematological parameters and body, liver and heart weights during incubation (at days 13, 15, 18 and 21). Physical parameter values were lower in 29-wk-old broiler breeder eggs than those of 60-wk-old breeders, except for relative eggshell weight, which was higher. In both male and female embryos, erythrocytic parameters and the body, liver, and heart weights increased during the incubation. The embryos and their organs were heavier when derived from 60-wk-old breeder eggs as compared to 29-wk-old breeder eggs. At hatching, hematocrit values were higher in males than in females. Thrombocytes were the most frequent leukocytes in the blood. Thrombocyte percentage decreased and lymphocyte percentage increased during the last days of incubation. The results showed maternal age influence only on body, heart and liver weights, focal sex-related influence the hematocrit at hatching, and temporal effect of incubation on body and organ weights, as well as on red blood cell count, hematocrit, hemoglobin, plasma glucose, and lymphocytes, which increased during the incubation period, while mean corpuscular volume and thrombocyte values decreased