Szerző szerinti böngészés "Baccouri, Wissem"

Megjelenítve 1 - 3 (Összesen 3)
  • Nincs kép
    TételSzabadon hozzáférhető
    Heat stress of cattle from embryonic phase until culling
    (2023-06-05) Baccouri, Wissem; Mikó, Edit; Komlósi, István
    Heat stress becomes a serious problem in the livestock sector as it affects cows' performance negatively. The objective of this paper review is to investigate the effects of heat stress during the different phases of the life cycle of cows; embryos, calves, heifers, and cows. Heat stress during early maternal gestation affects the ability of embryos to develop increasing the risk of abortion and early embryonic death. Heat stress during late maternal gestation affects the performance of calves and heifers later in their life, as it reduces growth performance, conducts physiological changes, impaired immunity, changes the behavior, and reduces the length and intensity of the estrus in heifers with decreasing in milk production in the first lactation. On the level of cows, milk quality and production, meat quality, and the final body weight decrease under hot temperatures. Heat stress decreases the conception rate, alters follicle growth, and estrous symptoms. Hormones secretion and physiological changes because of the heat stress conduct to impair the immunity system, and in oxidative stress and death in some cases. Same as for calves and heifers a change in the behavior of cows was detected in order to decrease their temperature.
  • Nincs kép
    TételSzabadon hozzáférhető
    Heat stress of cattle from embryonic phase until culling
    (2023) Baccouri, Wissem; Mikó, Edit; Komlósi, István
  • Nincs kép
    TételKorlátozottan hozzáférhető
    Longevity in Hungarian simmental beef purposed cattle
    Baccouri, Wissem; Posta, János; DE--Mezőgazdaság- Élelmiszertudományi és Környezetgazdálkodási Kar
    The main objectives of this work were to study and analyze the longevity of the Hungarian Simmental beef purposed breed cattle. Secondly, evaluate the size of the herd, age at first calving, year, month, and season of first calving, as well as the sex of the first calf effects on the longevity of the Hungarian Simmental beef purposed breed cattle. The used data were obtained from the Hungarian Simmental breeders’ associations with the first calving recorded between 1986 and 2021. For the genetic analysis of functional longevity, the Weibull proportional hazards model was used. The results showed that the fixed effects had a significant effect on longevity.