Effects Of Thermoresistant Stress Additives On Yield Performance Of Dairy Buffaloes

The experimental objective: Estimated the influence of high temperature and humidity weather on dairy buffaloes, and determined the occurrence of heat stress. Thermoresistant stress additives were applied with the feeds to dairy buffalos, to test improvement effects of additives on milk performance of dairy buffaloes under torrid weather, and to abate impact of high temperature and humidity on milk performance of dairy buffaloes.The experimental methods: Three thermoresistant stress additives (l,chromium picolinate Cr(C₆H₄NO₂)₃; 2, potassium carbonate (K₂CO₃) and sodium bicarbonate (NaHCO₃); 3, nicotinic acid C₆H₅NO₂) were applied with the feeds to dairy buffalos. The experiment was single design. 24 dairy buffaloes were divided into 4 teams, to experimental feed one month. The temperature and humidity of environment, milk yield and milk quality, rectum temperature and respiration rate, index of serum, dry matters (DM) intake, and digestive rate of crude protein (CP) and crude fiber (CF) were determined.The experimental results: Thermoresistant stress additives could obviously improved milk yield of buffalo, and retard decrease of lactation curve to keep yield performance. The total milk yield increased 23.49%,17.10% and 29.26% in experimental period, respectively. The milk fat, protein, lactose and SnF content of nicotinic acid team were significantly increased (P<0.05), the milk quality of others team were not significantly increased (P>0.05). Rectum temperature and respiration rate of dairy buffaloes was in normal range, and the difference of electrolyte concentration in serum of each team was not significant (P>0.05). The Blood Urea Nitrogen (BUN) concentration of nicotinic acid team was lowest, and its Glucose (GLU) concentration was highest. The concentration of Total Protein (TP), Albumin (ALB) and Globulose (Glo) in serum of each team was not significantly different (P>0.05). The concentration of Aspartate Transaminase (AST) and Alanine Aminotransferase (ALT) in serum of inorganic salt team was significantly higher than others (P<0.05), and its Alkaline phosphatase (ALP) and Creatine kinase (CK) was very high. The Triiodothyronine (T3) and Thyroxine (T4) of organic chromium was highest, and its T3 was significantly higher than blank's (P<0.05). All additives could significantly increased dry matter intake (P<0.05), inorganic salt could significantly increased apparent digestibility (AD) of CF (P<0.05). Conclusions: These thermoresistant stress additives could improve lactation performance of dairy buffalo under high temperature and humidity, but inorganic salt might harm buffalo body at the experiment. In this experiment, dairy buffaloes did not obviously appear heat stress reaction. High temperature and high humidity could negatively affect milk yield, thermoresistant stress could improve milk yield.