[Chemical changes in colostrum fermented with sorghum].
Colostrum from Holstein cows was collected during the first three days post partum. Ground sorghum (7.5%) was added to it. Untreated colostrum used as control, and sorghum treated colostrum samples were allowed to ferment for 0, 8 or 21 days at 18-20 degrees C in glass containers; pH, moisture, crude protein, digestible protein, ammonia, lactic acid and total energy were analyzed in untreated and treated samples. Crude protein was not significantly different (P > 0.01) in control colostrum (7.12, 5.76, 5.70%) and treated colostrum (6.66, 5.71, 5.98%) at 0, 8 and 21 days of fermentation respectively. Digestible protein was higher (P < 0.01) in the untreated (90.0, 93.0%) than in the treated colostrum (89.0, 81.0, 86.0%). Ammonia content was also higher (P < 0.01) in the control (0.25, 1.31, 1.37%) than in the treated one (0.23, 0.97, 1.20%). Lactic acid was lower (P < 0.01) in the untreated colostrum (0.82 g/100 ml) than in the treated colostrum (1.24 g/100 ml) after 21 days of fermentation. Total energy values were lower (P < 0.01) at 8 and 21 days of fermentation in the untreated (0.91, 0.84 Kcal/g) than in the treated colostrum (1.16, 0.97 Kcal/g). The addition of sorghum to colostrum reduced the crude, protein degradation and the ammonia content after 8 and 21 days of fermentation, increasing total energy and lactic acid content after 21 days of fermentation.
Díaz Cruz
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Departamento de Nutrición Animal y Bioquímica, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad Universitaria, México, D.F., México.
Ortega Cerrilla
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D000641:Ammonia / Q000032:analysis; D000821:Animal Feed; D000818:Animals; D001682:Biological Availability; D002417:Cattle / Q000378:metabolism; D003126:Colostrum / Q000737:chemistry*; D004044:Dietary Proteins / Q000032:analysis; D002523:Edible Grain; D005260:Female; D005285:Fermentation; D005516:Food Microbiology; D006863:Hydrogen-Ion Concentration; D019344:Lactic Acid / Q000032:analysis
D004044:Dietary Proteins; D019344:Lactic Acid; D000641:Ammonia