Long-term effects of good handling practices during the pre-weaning period of crossbred dairy heifer calves
The aim of this study was to determine whether applying good practices of handling during the pre-weaning period have long-term effects on behavioral and physiological indicators, health status, and average daily gain (ADG) of crossbred Bos taurus × Bos indicus heifer calves. During the pre-weaning period, 98 crossbred of Holstein × Gir heifer calves were allotted into three treatments: (1) good practices of handling + brushing (GPB; n = 25), (2) good practices of handling (GP; n = 25), and (3) control (n = 48). Every 2 months, four evaluation periods (EV1 to EV4) were conducted to record data. Behavioral indicators comprised time to drive (TD), flight speed (FS), flight distance (FD), and composite reactivity score (CRS). Physiological indicators of acute stress during handling comprised respiratory and heart rates. Health status comprised data regarding occurrence of most common diseases (i.e., pneumonia and anaplasmosis). Collected data were analyzed by using a linear mixed model for repeated measures, Tukey’s test, and chi-squared procedures. Treatment influenced (P < 0.05) TD, FS, and FD but not CRS (P = 0.78). From EV1 to EV3, the control calves had the lowest TD. The GPB group had lower FS than the control but did not differ from GP. The GPB group had lower FD means than the other two groups in EV2, EV3, and EV4. No differences (P > 0.05) due to treatment were observed on heart and respiratory rates, ADG, or occurrence of pneumonia and anaplasmosis. It was concluded that adoption of good practices of handling during pre-weaning period may lead to long-term positive effects.
Improvements in the behaviour of Gir dairy cows after training with brushing
ABSTRACT The cow’s behaviour and temperament influence handling and productivity. Training including tactile stimuli can improve zebu cow behaviour. The aim of the study was to utilize tactile stimulation training in Gir dairy cows during 14 days and measure cow behaviour. A total of 27 cows were brushed in a squeeze chute. Behavioural parameters, respiratory rate (RR) and rectal temperature (RT) were evaluated. The temperature and humidity of the environment was recorded to calculate the temperature and humidity index (THI). The THI demonstrated that the environmental conditions did not induce thermal stress. All behavioural variables showed improvements with training over time. The ‘calm’ score increased throughout the training, corroborating the movement and displacement behavioural characteristics, regardless of the parturition order. Initially, 56.6% of the cows walked to exit a chute while others trotted or ran, and, at the end of the days of training, 96.0% of the cows exited the chute by walking. A decrease in the RT and RR was verified between the first to 7th and 14th day of training. Brushing training was effective in calming the animals and improving the interaction with humans, thereby enhancing the human animal relationship.
On the fractionation of β-lactoglobulin and α-lactalbumin
Abstract Existing methods for the preparation of α-lactalbumin and β-lactoglobulin are examined critically. It is proposed that the most satisfactory method for the preparation of the whey protein fraction from bovine milk is (NH 4 ) 2 SO 4 fractionation. A number of new gentle procedures for the fractionation of the whey proteins are compared with some existing methods. The distribution of total protein at various stages is determined by total Kjeldahl nitrogen and the kind of protein by starch-gel electrophoresis. The effect of variables, such as pH, salt concentration and temperature on the separation of α-lactalbumin and serum albumin from β-lactoglobulin is studied. Differences in the behavior ( e.g. solubility) of genetic variants of β-lactoglobulin are noted. The solubility of each of the major whey proteins, under similar conditions to those used in the fractionation, is compared with its solubility in the whey protein mixture. The understanding gained of factors important in the fractionation is used in recommending new procedures for α-lactalbumin and β-lactoglobulin isolation.