Effects Of RUP And Anion Salts In Dairy Ration On Milk Performance And Blood Parameters Of Lactating Cow And Dry Cow

Two experiments were conducted to study the effects of RUP and Anion Salts in Dairy Ration on Milk Performance and Blood Parameters of Lactating Cow and Dry Cow . The first experiment (Dietary cation-anion balance and magnesium intake of the dry cow) Thirty multiparous Holstein cows, 3 weeks precalving, were randomly allocated to six dietary treatments (5 cows/treatment). Cows were allocated randomly to treatment on the basis age and body weight. The dietary treatments: l.LDCAB(low DCAB),:the basic dietary with anion salt , DCAB value is -125 mEq/KgDM;2. LDCAB+MgO(low DCAB and MgO ),supplemented MgO base on treatment l,the DCAB value is still -125 mEq/KgDM;3.MDCAB (moderate DCAB),the basic dietary with anion salt, DCAB value is -75 mEq/KgDM; 4. MDCAB+MgO (moderate DCAB and MgO), supplemented MgO base on treatment 3, the DCAB value is still -75 mEq/KgDM;5.HDCAB(high DCAB) ,the basic dietary DCAB value is 72 mEq/KgDM;6.HDCAB+MgO(high DCAB and MgO),supplemented MgO base on treatment 5,the DCAB value is still 72mEq/KgDM.The study shown that (1) During 2~llweeks of postcalving the milk production ,milk fat and milk protein were no significant difference (P>0.05), but treatment MDCAB+MgO milk production(1929.90±245.03kg) was higher than LDCAB, LDCAB+MgO, MDCAB, HDCAB, HDCAB+MgO; (2) The DMI of LDCAB and LDCAB+MgO dramatic decrease (P<0.01) than the others; (3) During 3 weeks precalving urinary pH were no significant difference (P<0.05) in the same DCAB level ,but urinary pH were decreased with decreasing of DCAB, urinary pH of HDCAB, HDCAB+MgO were higher than others, respectively were 8.36 ± 0.16,8.25 ± 0.22, urinary pH of LDCAB, LDCAB+MgO, MDCAB ,MDCAB+MgO respectively were7.17±0.24,7.24±0.17,7.53±0.35,7.69±0.22; (4) During precalving LDCAB, LDCAB+MgO plasma C1 were significantly higher (P<0.01) than HDCAB, HDCAB+MgO, MDCAB, MDCAB+MgO were no significant difference (P>0.05) with other treatments ,but their concentration of plasma Cl were in midst of LDCAB, LDCAB+MgO and HDCAB, HDCAB+MgO, During postcalving LDCAB , LDCAB+MgO plasma Cl were significantly higher (P<0.05) than HDCAB, HDCAB+MgO, plasma Cl of MDCAB ,MDCAB+MgO were in midst of LDCAB,LDCAB+MgO and HDCAB. HDCAB+MgO; (5) During precalving LDCAB+MgO and MDCAB+MgO were significantly higher (P<0.05) than HDCAB in plasma magnesium, plasma magnesium of treatments with magnesium is slightly higher than that of treatments without magnesium, During postcalving plasma magnesium of LDCAB+MgO is significantly higher (P<0.01) than that of HDCAB; (6) During precalving and postcalving all treatments were no significant difference in the concentration of plasma K and Na . During postcalving HDCAB (P<0.01), HDCAB+MgO (P<0.05) were significantly higher (P<0.01) than other treatments in the concentration of plasma K . LDCAB, LDCAB+MgO were no significant difference (P>0.05) in the concentration of plasma Na, but plasma Na of LDCAB is significantly lower ( P<0.0l) than that of other treatments , plasma Na of LDCAB+MgO is significantly lower than that of MDCAB+MgO (P<0.05) and other three treatments (P<0.01) ; (7) There were no significant difference (P>0.05) in the concentration of plasma P of all treatments during precalving and postcalving; (8) There were no significant difference (P>0.05) in the concentration of plasma Ca2+ of all treatments during precalving. plasma Ca2+ of HDCAB is significantly lower than that of other treatments, plasma Ca2+of HDCAB+MgO is significantly lower than that of MDCAB+MgO (P<0.01) and other three treatments (P<0.05) during postcalving; (9) There were no significant difference (P>0.05) in the concentration of plasma OH (hydroxy) -proline of all treatments during precalving. plasma OH-proline of HDCAB and HDCAB+MgO was significantly lower ( P<0.01) than that of other treatments, and plasma OH-proline of LDCAB+MgO was significantly higher ( P<0.05) than that of MDCAB During postcalving;(10) During precalving and postcalving the concentration of plasma PTH of HDCAB and HDCAB+MgO were significantly lower (P<0.01) than the other treatments ,the different value of precalving and postcalving of PTH , LDCAB and LDCAB+MgO were significantly higher ( P<0.01) than that of MDCAB, MDCAB+MgO , MDCAB and MDCAB+MgO were significantly higher(P<0.01 )than that of HDCAB and HDCAB+MgO During postcalving;(ll) Retained placenta was found tow of five in HDCAB and one of five in HDCAB+MgO, Udder oedema was found all of cows HDCAB and HDCAB+MgO , was not found in the other treatments.The second experiment (the effect of different RUP of dietary on milk production and BUN):Six lactating Holstein cows in studying the effects of feeding different rumen-undegradable protein (RUP) on milk production, milk composition and blood urine N were used in a replicated 3x3 Latin square.CP (%) and energy (MJ/kg) of the 3 dietaries were in the same level, but the calculated RUP (%) of diets(on a dry matter (DM) basis ) were 1. LRUP 7.1 %, 2. MRUP 9.1 %, 3. HRUP 11.2 % .The study shown that, (1) Milk fat percent of LRUP(3.51 ±0.086) and HRUP(3.57...