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Iranian Journal of Veterinary Research، جلد ۷، شماره ۲، صفحات ۳۱-۳۷
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عنوان انگلیسی Changes of milk fat, crude protein, true protein, NPN and protein:fat ratio in Holstein cows fed a high concentrate diet from early to late lactation
چکیده انگلیسی مقاله Percentages and yields of fat, crude protein (CP), true protein (TP) and non-protein nitrogen (NPN) wereassessed in milk of four groups of Holstein cows, at early, mid and late lactation (days in milk 20-70, 71-110, 111-150 and 151-210), on a diet rich in concentrates during a hot summer. Four milk samples were taken from individual cows at 10-day intervals. Milk fat percentages were close to breed average and increased toward the end of lactation with a tendency (P = 0.055) for significant difference between the early and late lactation. Percentages of CP (P = 0.14) and TP (P = 0.478), however, were low similarly among all groups and did not follow the normal pattern of the breed. Percentage of NPN was significantly higher in groups III and IV (P = 0.005). Yields of fat (P = 0.035), CP (P = 0.002) and TP (P = 0.001), but not NPN (P = 0.589), decreased toward the end of lactation. There was a negative correlation (r = -0.354, P
کلیدواژه‌های انگلیسی مقاله milk,Fat,Protein,NPN,Lactation cycle
نویسندگان مقاله m محبی فانی | mohebbi fani
department of animal health management, school of veterinary medicine, university of shiraz, shiraz, iran
سازمان اصلی تایید شده: دانشگاه شیراز (Shiraz university)

سید سعید شکرفروش | s s
department of food hygiene and public health, school of veterinary medicine, university of shiraz, shiraz, iran
سازمان اصلی تایید شده: دانشگاه شیراز (Shiraz university)

m دهداری |
graduated from school of veterinary medicine, university of shiraz, shiraz, iran
سازمان اصلی تایید شده: دانشگاه شیراز (Shiraz university)

s ناهید |
graduated from school of veterinary medicine, university of shiraz, shiraz, iran
سازمان اصلی تایید شده: دانشگاه شیراز (Shiraz university)

نشانی اینترنتی http://ijvr.shirazu.ac.ir/article_2660_9be0de0513d9c28c03ce5adf2b1cb34c.pdf
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