摘要
选取2胎以上的处于泌乳中期100~125DIM的荷斯坦奶牛9头,采用随机试验设计分成3组,随机饲喂3种DCAD值分别为:+25、+35、+45mEq/100gDM的日粮。研究不同DCAD日粮对泌乳中期奶牛泌乳性能、血清矿物离子和尿液矿物离子浓度的影响。结果表明:随日粮DCAD值增大,奶牛尿液中Na+、K+的排泄增加,而Ca2+和肌酐的排泄则降低(P<0.05),其它离子水平变化不显著。血清中P5+浓度随DCAD值增大而上升。当日粮DCAD值为+35mEq/100gDM时,泌乳中期奶牛产奶量和4%标准乳产量分别为(29.12±0.65)kg/d和(28.73±0.96)kg/d,比日粮DCAD值为+45mEq/100gDM时提高4.82%和4.66%;而乳蛋白产量和乳糖产量分别为(0.93±0.03)kg/d,1.40±0.02kg/d,比日粮DCAD值为+45mEq/100gDM时提高10.71%和6.87%。
Effects of dietary cation-anion difference(DCAD)with a positive value of +25, +35 and +45mEq/100g dry matter(DM)respectively on milk production level, serum and urine mineral contents of mid-lactating dairy cows was examined in a complete randomized design. Three DCAD diets were randomly allotted to three groups. Each group contained three Holstein dairy cows. Urine sodium and potassium excretion increased with increasing DCAD value positively and the urine calcium and creatinine excretion decreased with increasing DCAD value positively, the concentrations of other ions were unaffected. Serum phosphorus concentration increased with increasing DCAD value positively.The yield of milk,milk protein,milk lactose and 4%FCM(29.12±0.65kg/d,0.93±0.03kg/d,1.40±0.02kg/d,28.73±0.96kg/d)was 4.82%, 10.71%,6.87% and 4.66% higher on DCAD of+35mEq/100g of DM than on DCAD of+45mEq/100g of DM respectively.
出处
《中国奶牛》
2009年第6期10-14,共5页
China Dairy Cattle