In the context of global warming, heat stress has become one major factors limiting dairy cattle production. Although many methods have been explored to help cows mitigate negative effects during hot summer months, maintaining performance high-yielding under is still a great challenge. The aim this trial was investigate effect RP-GABA in diet on milk yield, composition and serum biochemical par...

The objective of this study was to analyze the correlation between Holstein body conformation traits and milk production traits in the Shanghai region. In total, 871 Holstein cows were randomly chosen from 28 dairy farms in Shanghai at second stage of lactation as the object of our study. Five milk production traits, including 305-d milk yield, butter fat percentage, milk protein percentage, pe...

milk performance (protein and fat content) and milk fatty acids (fa) profile of dairy cows under supplementation with two sources of concentrate, oilseeds (c, cottonseed) at two levels, low (5kg dm/cow/day) and high (7 kg dm/cow/day), and cereal grains (b, barley) at high rate (7 kg dm/cow/day), were studied in three herds (n=36) of spring calving holstein-friesian dairy cows (200 days in milk)...

Dairy cattle breeding is one of the most important branches livestock production, which has been facing, for several decades, chronic problem declining reproductive performance. In 2005, number worldwide was about 1,370,000,000, while in 2015 that dropped below billion, and 2021 it shows a slight recovery as 1,000,970. This indicates importance applying different protocols order to increase cow...

Objectives were to evaluate effects of feeding a calcium salt rich in linoleic and trans-octadecenoic acids (LTFA) on synthesis of prostaglandin F(2alpha) based on its metabolite (PGFM), uterine involution and pregnancy rates in lactating dairy cows. Five hundred and eleven Holstein cows were blocked according to parity, body condition score and milk yield in the previous lactation. Primiparous...

Milk performance (protein and fat content) and milk fatty acids (FA) profile of dairy cows under supplementation with two sources of concentrate, oilseeds (C, cottonseed) at two levels, low (5kg DM/cow/day) and high (7 kg DM/cow/day), and cereal grains (B, barley) at high rate (7 kg DM/cow/day), were studied in three herds (n=36) of spring calving Holstein-Friesian dairy cows (200 days in milk)...

In the tropical and subtropical regions, high temperatures affect dairy cattle, reducing the metabolic activities of the animal and decreasing the blood flow to the udder. Cattle with the slick hair gene tolerate high temperatures and humidity much better than normal haired cows. The objective of the present study was to determine if the effect on lacta­ tion performance of slick hair gene cows...

the objective of this study was to evaluate the effects of supplementation of different level protein diets with rumen protected methionine and lysine on performance and ruminal parameters in holstein dairy cows when in their early lactation. twenty one dairy cows in their early lactations were assigned to three treatments in a randomized block design experiment of a 35-d duration period. diets...