Utilization possibilities of surplus colostrum by acidification with formic acid in rearing calves I. Changes in some characteristics of acidified colostrum stored at summer ambient temperatures or in a refrigerator
2003
Kaya, I. | Uzmay, C. (Ege Univ., Izmir (Turkey). Dept. of Animal Science) | Uysal, H. | Kaya, A.
Use of surplus colostrum, which was collected from the first eight milking postpartum, in calf rearing programs was investigated in two trials. In trial 1, colostrum that was acidified with formic acid and stored at summer ambient temperatures (ACAT), or milk replacer that was acidified with formic acid were fed to calves. In trial 2, calves were fed colostrum stored in refrigerator (2 to 4 degree centigrade) after formic acid addition (ACRE). Liquid diets were acidified with formic acid at 0.23 % vol/wt. Each batch of acidified colostrum (8 batches in ACAT and 10 batches in ACRE) was labelled 0 days old when colostrum from first eight milking was mixed. Colostrum samples were collected at days 0, 5, 10, 15, 20 and 25 of storage. Mean pH for acidified colostrum stored at summer ambient temperatures was 4.35 at day 0, it decreased to 3.56 at day 10 (P less than 0.05) and then began increasing and rose to 4.59 on the 25th day of storage (P less than 0.05). Mean pH for acidified colostrum stored in refrigerator was almost constant during 20 days of storage. Then it began increasing, but the increase was slow. During the storage period, there was no significant change in titratable acidity, specific gravity, or DM content of acidified colostrum stored in refrigerator. DM content of colostrum stored in refrigerator was 14.13 % at day 0 and 13.90 % at day 25. Titratable acidity of acidified colostrum stored at summer ambient temperatures increased rapidly during the first 10 days of storage (P less than 0.05) and then began decreasing. There was a marked decline with time in the specific gravity of colostrum stored at summer ambient temperatures (P less than 0.05). DM content of acidified colostrum stored at summer ambient temperatures decreased significantly with storage time. It was 14.00% at day 0 and declined to 12.21 % at day 15 and to 9.95 % at day 25 (P less than 0.05). Storing acidified colostrum in refrigerator ensured an effective preservation.
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