Effects Of Feeding Fatty Acid Calcium And The Interaction Of Forage Quality On Feed Intake And Production Performance In Early Lactation

Energy metabolism in early lactation cows is characteristic of negative energy balancecaused by the decrease of dry matter intake and the increase of body energy demand. Thesevere negative energy balance is easy to bring about metabolism disorders, affecting theproduction performance of dairy cows. In order to alleviate the negative energy balance,usually measures were taken to improve the roughage quality level, increase the intake ofconcentrate and feed dietary fat. To understand the effects of fatty acid calcium and roughagequality on mechanism and results of mitigating negative energy balance in the early lactationcows, in the experiment, effects of feeding fatty acid calcium and the interaction of foragequality on feed intake and production of performance in early lactation were observed, Inorder to provide a theoretical basis for dairy production.In trail1, Holstein cows (n=12) of the same similar milk yield and multiparous earlylactation Holstein cows were randomly divided into four groups. TreatmentⅠfed basal diet,Treatment II fed the basal diet added4%fatty acid calcium(DM basis), Treatment III fed thebasal diet added2.5kg corn meal. The experiment period was21days. The milk samples andthe remaining material samples and blood samples were collected for two days in the end ofthe trail and the start. The results indicated that the DMI decreased4.03%in the group offeeding fatty acid calcium compared with the control group, and feeding corn group IIIcompared with control group increased6.24%, but there is no significant difference (P>0.1).Milk production increased by approximately16.8%in group II, but milk protein, lactosepercentage tended to decrease (0.05<P<0.1), and the SNF content decreased significantly (P<0.05), milk fat percentage and yield did not change significantly (P>0.1). The concentrationof ApoA-IV and Serotonin increased significantly (P <0.01) compared with group III, and theconcentration of BHBA, INS and GLU reduced, but the serum indicators TG、NEFA、GN、GLP-1、CCK、Leptin、ApoA-IV、Serotonin、MC increased varying degrees.In trail2, Holstein cows (n=16) of the same similar milk yield and multiparous earlylactation Holstein cows were randomly divided into four groups. Treatments were four dietsof different dietary energy source: Treatment A was for low-quality roughage, Treatment Bwas for low-quality roughage addition400g fatty acid calcium, Treatment C was for high-quality forage, Treatment D was for high-quality forage addition400g fatty acidcalcium. The experiment period was30days.The milk samples and the remaining materialsamples and blood samples were collected in the end of the trail. The results indicated thatdiets B and D of feeding fatty acid calcium decreased intake significantly (P<0.01), the intakeof dietary group C than in group A slightly higher. Milk yield increased by16.41%in groupC of fed high-quality roughage than group A, When feeding fatty acid calcium, milkproduction increased in group B, but a downward trend in group D(0.05<P<0.1). Milk fatpercentage and production has been high in group B and D, but the difference is notsignificant significantly (P>0.05), the content of milk protein was decreased significantly(P<0.01), and the forage quality and fatty acid calcium have a significant interaction effect (P<0.05), the content of SNF was also decreased significantly (P<0.01), the content of milk ureanitrogen increased significantly (P<0.05). Under the high-fat diet conditions, theconcentration of BHBA in group B and D was significantly lower (P<0.05), and TG, NEFA,glucagon, GLP-1, CCK, leptin, ApoA-IV, serotonin and MSH concentration increased, butthe difference was not significant, the CCK concentration and feed intake showed asignificant negative correlation (P <0.05).