CRITICAL POINTS IN THE FEEDING OF HIGH YIELDING DAIRY COWS Gergácz, Z., †Báder, E., Szűcs, E. University of West Hungary, Faculty of Agricultural and Food.

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CRITICAL POINTS IN THE FEEDING OF HIGH YIELDING DAIRY COWS Gergácz, Z., †Báder, E., Szűcs, E. University of West Hungary, Faculty of Agricultural and Food Sciences Mosonmagyaróvár, Hungary

AIM OF THE STUDY The aim of the study was to analyse the relationship between the body condition and the results of metabolic profile test have been done in dairy cows in different days in milk (DIM). The aim of the study was to analyse the relationship between the body condition and the results of metabolic profile test have been done in dairy cows in different days in milk (DIM).

INTRODUCTION Body Condition Score (BCS) is a useful management tool to assess body fat stores especially in Holstein dairy cows. The method is based on a visual and tactile appraisal of body fat reserves in the back and pelvic regions and BCS is usually scored on a scale of 1 to 5. (Edmonson et al. 1989). Body Condition Score (BCS) is a useful management tool to assess body fat stores especially in Holstein dairy cows. The method is based on a visual and tactile appraisal of body fat reserves in the back and pelvic regions and BCS is usually scored on a scale of 1 to 5. (Edmonson et al. 1989). The BCS has been proposed to measure changes in body reserve as a result of negative energy balance (Berry et al., 2002). The BCS has been proposed to measure changes in body reserve as a result of negative energy balance (Berry et al., 2002).

INTRODUCTION Dairy cattle, like most lactating mammals, are usually in negative energy balance in the first few weeks of lactation (Nielsen, 1999) Dairy cattle, like most lactating mammals, are usually in negative energy balance in the first few weeks of lactation (Nielsen, 1999) The selection for milk yield increases the gap between energy input and output during early lactation because DMI has not been included directly in the breeding goal (Veerkamp and Brotherstone, 1998) The selection for milk yield increases the gap between energy input and output during early lactation because DMI has not been included directly in the breeding goal (Veerkamp and Brotherstone, 1998)

INTRODUCTION High yielding dairy cows express more severe prolonged negative energy balance, which results in greater biological stress.This stress may impact upon the reproduction and immune systems leading to fertility and health problems during and beyond the negative energy balance period (Berry et al., 2002). High yielding dairy cows express more severe prolonged negative energy balance, which results in greater biological stress.This stress may impact upon the reproduction and immune systems leading to fertility and health problems during and beyond the negative energy balance period (Berry et al., 2002).

MATERIAL AND METHODS Blood samples (N = 1984) were taken from clinically healthy, randomly selected animals (1-20 days before calving, 1-30 after calving, and older than 30 days after calving). Samples were taken after the morning feeding in the 3-5 hours. Blood samples (N = 1984) were taken from clinically healthy, randomly selected animals (1-20 days before calving, 1-30 after calving, and older than 30 days after calving). Samples were taken after the morning feeding in the 3-5 hours. Physiological values in samples taken were analysed as follows: blood’s haemoglobin, the plasma’s aceto-acetic acid, FFA, glucose, urea concentration and AST’s activity value, and the urine’s pH, NABE and urea parameters. Physiological values in samples taken were analysed as follows: blood’s haemoglobin, the plasma’s aceto-acetic acid, FFA, glucose, urea concentration and AST’s activity value, and the urine’s pH, NABE and urea parameters. Brydl summarized the normal values (reference values) characterizing the metabolism of dairy cows. (The brown dotted lines are shown in the Figures also.) Brydl summarized the normal values (reference values) characterizing the metabolism of dairy cows. (The brown dotted lines are shown in the Figures also.) Simultaneously, body condition of all animals was evaluated using a 5 point scale. Simultaneously, body condition of all animals was evaluated using a 5 point scale.

RESULTS (P<0.001)

RESULTS (P<0.01)

RESULTS (P<0.05)

RESULTS (P<0.01)

RESULTS (P<0.05)

CONCLUSION According to our results could validated may estimate the critical periods of lactation by the BCS and metabolic profile tests in high yielding dairy cows. According to our results could validated may estimate the critical periods of lactation by the BCS and metabolic profile tests in high yielding dairy cows. The largest risks of diseases and economic damage were in first 50 DIM after calving. The normal rumen functions and the harmonious nutriment supply according to the needs of the animals should be reinstated by optimizing the TMR formulas. The largest risks of diseases and economic damage were in first 50 DIM after calving. The normal rumen functions and the harmonious nutriment supply according to the needs of the animals should be reinstated by optimizing the TMR formulas. The results of the study confirm that the body condition scoring is a reliable and cheap tool for revealing the risk of metabolic disorders caused by malnutrition. The results of the study confirm that the body condition scoring is a reliable and cheap tool for revealing the risk of metabolic disorders caused by malnutrition.

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