The transition period for dairy cows, which refers to the time from 3 weeks before through 3 weeks after calving, is now recognized as the most critical phase of the lactation cycle (Drackley , 1999) . Nutrition and management during this period essentially determine the profitability of th e cow for the remainder of the lactation . A problem-filled transition gets cows off to a poor start to l...

Abstract The aim of this study was to evaluate the heat stress influence on milk production from primiparous and multiparous Holstein-Friesian cows estimate economic losses associated with decrease in farm’s yield. selected for were middle phase 1st, 2nd, 3rd lactation characterized by similar daily production. Additionally, animals kept same conditions fed feeds throughout season. analysis cov...

The periparturient period of the lactation cycle in dairy cattle is characterized by dramatic changes in nutrient demand that necessitate exquisite coordination of metabolism to meet requirements for energy, glucose, and amino acids by the mammary gland following calving. To meet their energy requirements during the first weeks of lactation, dairy cows mobilize large quantities of fatty acids f...

The objective of this study was to assess the effects feeding gelatin capsules containing fish oil, treated with alcoholic solutions flavoring agents followed by drying, on lactation performance, rumen fatty acids content and milk enrichment acids. In Trial 1, four multiparous ruminally fistulated Holstein cows were randomly assigned one dietary treatments sequences in a 4 × Latin square design...

In the past, efforts to improve the transition to lactation have focused largely on preventing infections and maximizing energy intake in transition cows, and these have generally been treated as independent issues. However, new models are emerging to explain the development of numerous transition disorders. A combination of insults, including social stress, negative energy balance, heat stress...

Introduction In order to achieve high reproductive efficiency and high milk production, herds must properly manage the entire non‐lactating period and early lactation. We refer to this time period as The Vital 90TM Days and it begins approximately 60 days before calving and continues through the first 30 days of lactation. During this time, dairy cows are exposed to a series of biological and p...

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...