SANCHAI JATURASITHA1, RAKKEART NORKEAW1, THERDCHAI VEARASILP1, THUMRONGSAKD PHONBUMRUNG2, KHEMSAWAT CHEERAWAT2, MICHAEL WICKE3
1Chiang Mai University, Department of Animal Science, Thailand
2Department of Livestock Development, Animal Nutrition Division, Thailand
3Georg-August-Universität Göttingen, Inst. of Animal Breeding and Husbandry, Germany
Native cattle of the family of Bos indicus are in Thailand kept as draught animals mainly in rice fields. After field discharge some are sold in the market and later slaughtered. The beef quality is poor because the animals are slaughtered at old age. The objective of this investigation was to study the beef quality of 3 years old native cattle grazed on different types of pasture. Twelve calves were reared with their dams until one year of age after which they were randomly divided into two groups and grazed for the next two years. One group of calves was grazed on a pasture of pure Guinea grass (Panicum maxima) whereas the second group was kept on Guinea grass mixed with the legume Stylosanthes guianensis. The three years old calves were slaughtered and their Longissimus dorsis collected in order to study the meat quality. Meat quality in terms of pH- and conductivity value was not significantly different between the two groups (P>0.05). The lightness value (L) of meat of cattle grazed on Guinea grass was darker than that of cattle grazed on mixed pasture (P<0.01). The sensory evaluation in terms of tenderness, taste and acceptability found no significant difference between the groups (P>0.05) whereas the juiciness of the beef from the group grazed on Guinea grass pasture was higher than that of the group grazed on mixed pasture (P<0.05). The chemical composition, water holding capacity, shear force value as well as collagen content of beef were not statistically different (P>0.05) between the two groups whereas the cholesterol and triglyceride content of beef from animals grazed on pure Guinea grass was lower than from those grazed on mixed pasture (P<0.05). In conclusion, Thai native cattle grazed on pure Guinea grass pasture had a more favourable beef quality compared to cattle grazed on Guinea grass mixed with legume.
Keywords: Beef quality, grazing type, Thai native cattle