Untitled

Abstract

Twenty each of healthy lactating Friesian and Holstein cows were studied. They were of similar age and body weight, nonpregnant in their third lactation and 80-100 days post partum. The investigation was carried out for 8 weeks on two farms at the same time during the hot summer season in Egypt. The first farm was in Demietta (North east of the Nile Delta, 31 degrees 40' N) on 20 Friesian cows and the second was in Fakous (East of the Nile Delta, 30 degrees 40' N) on 20 Holstein cows. On each of the two farms, 10 cows were newly imported and 10 were born in Egypt. The average daily milk yield and total milk production in the third lactation of the newly imported cows were significantly higher than those of the locally born cows for both Friesians and Holsteins. At the same time, the T4, T3, urea-N, haematological values and AST enzyme activity in the newly imported cows were significantly lower than those in the locally born ones in both breeds, while the locally born cows showed significantly lower values for rectal temperature and respiration rate, as well as for AST and Alk-P enzyme activities, than the newly imported cows of either breed. Holstein cows surpassed the Friesians in milk production, as well as thyroid hormone secretion and cholesterol, haemoglobin, packed cell volume and erythrocyte count values. The opposite was found for serum total protein, urea-N and creatinine concentrations, leukocyte count and AST, ALT and Alk-P enzyme activities.

Silvopastoral system is an alternative to improve animal welfare and productive performance in meat production systems

“…Heart rate is a physiological response to stress due to adrenal stimulation and consequent rise in serum adrenaline and noradrenaline levels 33 . This response also increases during heat stress, especially when animals are raised in the tropics, but also in situations as fear, excitement, and physical exercise 13 , 32 , 34 .…”

Genome-Wide Association Study of Lactation Traits in Chinese Holstein Cows in Southern China

“…The GPT gene encodes glutamicpyruvate transaminase. Habeeb et al [36] conducted a study comparing the physiological and biochemical changes in Egyptian native cows and introduced cows under hot summer conditions, finding that serum levels of glutamate aminotransferase were significantly higher in native cows than in introduced cows under hot conditions, suggesting that the GPT gene may be associated with heat stress in dairy cows. The PYCR3 gene encodes a protein belonging to the pyrroline-5-carboxylic acid reductase family, which has been shown to be involved in genotoxic, inflammatory, and oxidative stress responses [37,38].…”

Ringworm Among Cattle

“…However, the factors such as species, numbers and age of animal besides environmental aspects will serve a significant role in the rate of infection (Emanabdeen 2018). Furthermore, a study conducted by Marai et al (1999) showed that the rate of ringworm infection among cattle higher in foreign breed than in native breed. According to studies conducted by Pascoe (1979) and Shams et al (2009) the prevalence rate was higher in the young animals.…”