Changes of Holstein Dairy Cow milk productivity until 150th day of lactation | Holšteinas šķirņu govju piena produktivitātes izmaiņas līdz 150. laktācijas dienai
2013
Petrovska, S., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Agrobiotechnology | Jonkus, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Agrobiotechnology
Test day records of milk productivity traits and fat – protein ratio in first 150 days of lactation of Holstein Black and White (HM; n = 20) and Holstein Red (HS; n = 15) cows were analysed. HM and HS cows were kept in stall housing system. Animals had ad libitum access to total mixed rations. Significantly highest milk yield was obtained from HM (in the 3rd recording 29.9 kg per day). The HS characterized by higher fat content in milk; in the 1st recording milk fat content was significantly higher of HS (4.29%) as that of HM (3.43%). Protein content was not significantly different among the breeds. The average fat – protein ratio during investigation were from 1.05 to 1.25 for HS and 0.97 to 1.13 for HM cows. HM group had higher risk to get ill with subacute acidosis.
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