Abstract
The research was conducted to examine the day-to-day variation in colostrum composition at the udder quarter level. For this purpose, a total of 3 Holstein Frisian crossbred cows were selected from Bangladesh Agricultural University Dairy Farm. Colostrum samples were collected both as mixed and separately from different teats. The concentration of major colostrum constituents (fat, protein, lactose, total solids, solids-not-fat, ash, pH, specific gravity) changed significantly (p≤0.05), the levels on day 4 were found similar to those of normal milk. The highest mean value of fat, protein, total solid, SNF, ash and specific gravity in colostrum was observed on 1st post-partum day as 6.02±0.70, 14.20±0.18, 23.88±1.25, 17.94±0.42, 1.03±0.05% and 1.05±0.00, respectively and later on, decreased as postpartum days advanced. Minimum average fat, protein, total solid, SNF, and ash content in colostrum was observed on 5th postpartum days as 3.75±0.11, 3.24±0.08, 12.00±0.20, 8.27±0.16% and 0.695±0.01, respectively. But lactose percent and pH showed an increasing trend from 1 to 5 postpartum days. Minimum average lactose and pH was observed on 1st and 5th postpartum days as 2.42±0.06%; 6.03±0.04% and 4.26±0.15; 6.30±0.04, respectively. The quality of colostrum produced by udder quarters was found significantly different (p<0.05). The rear quarters produced colostrum, which was significantly richer in fat, proteins, TS, pH compared to forequarters colostrum. The forequarters produced colostrum which was significantly richer in lactose, ash, SNF compared to forequarters colostrum. In conclusion, the results showed that colostrum composition was significantly changed up to 5 days post-partum.
Highlights
The nutritional and physiological requirements of the neonate during very early life are typically quite specialized
Several studies have evaluated the changes in the chemical composition of cow colostrum after parturition & buffalo colostrum, but no effective research has been done to determine the compositional changes of colostrum according to four different teats of the udder of Holstein Friesian cow, even though the topic remains of great importance mutually to milk producers and processors
There is an accelerated change in cow colostrum composition from the first milking until the fifth day of parturition
Summary
The nutritional and physiological requirements of the neonate during very early life are typically quite specialized. The first six postpartum milking's, or the number of milking's it takes or the transition from colostrum to whole milk to occur, are considered colostrum Of these six milkings, the first four reflect the majority of changes in composition. The first four reflect the majority of changes in composition During this period, the level of total protein, fat, total solids, solids-notfat, and ash decreases, lactose increases and cloistral Ig declines rapidly (Foley &Otterby, 1978). The concentration of the major colostrum constituents (milk protein, lactose, and solid not-fat extract) change significantly after birth, the levels on day 3 being similar to those of mature milk (Georgiev, 2005). The study was targeted to observe the 5 days post-partum changes in colostrum composition at the different teat quarter level of Holstein Friesian crossbred cows
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