RESEARCH IN PIG BREEDING, 11, 2017 (2)
CHEMICAL SCORE OF SOW’S COLOSTRUM
Rolinec M., Bíro D., Gálik B., Šimko M., Juráček M., Hanušovský O., Kanka T., Imrich I., Bučko O.
Slovak University of Agriculture in Nitra, Faculty of Agrobiology and Food Resources, Slovakia
The concentration and proportion of essential amino acids in sow’s colostrum changes every hour from the start of colostrum secretion. One of the parameters describing the protein quality of sow’s colostrum is the chemical score. The aim of this study was to determine the chemical score of colostrum of sows. Colostrum samples were collected every hour from birth of first piglet (h 0) till 12th hour after birth of first piglet (h 12). According to the concentration of essential amino acids (g.16 g N-1) in sow’s colostrum and in whole egg the chemical score (CSegg) were calculated. The highest value of CSegg was at 7th h (56.3%). The lowest value of CSegg was at 12th h (46.1%). When CSegg was calculated (whole egg was used as standard protein), in every sampling time isoleucine was the most limiting essential amino acid. During the first 12 h, protein of sow’s colostrum had not reached the quality of egg protein (CSegg < 100). Additionally, the average concentration of essential amino acids of sow’s milk was used as a standard protein for calculation of chemical score (CSsow’s milk). The values of CSsow’s milk were in interval from 80.2% (h 12) to 102.6% (h 9). When CSsow’s milk was calculated (sow’s milk was used as standard protein), isoleucine (h 0 and 1) and histidine (h 2, 3, 5, 6, 8, 10, 11 and 12) were the most limiting amino acids. At h 4, 7 and 9 there was no limiting essential amino acid (CSsow’s milk > 100). No significant (P>0.05) changes for CSegg and CSsow’s milk between colostrum samples collected at different times from the birth of the first piglet till 12th h were observed.
Key Words: Sow, colostrum, limiting essential amino acid, chemical score