Indicii de reproducţie şi interdependenţa lor cu vârsta la populaţia de taurine din rasa Holstein de selecţie olandeză
2018
Focşa, V. | Granaci, V. | Constandoglo, A, | Tataru, G. | Ciubatco, V.
The reproductive indices and their interdependence with milk productivity to cows population of the Holstein rase, Dutch selection was studded. It was established that the main reproduction indices prevail the optimal admise values, with the exception of the duration of the dry period, it is highlighting within the prescribed limits.The duration of the service-period so in the average of the herd of animals, as well as on the succesive lactation is mach higer than the value of optimal accepted; in our case, the duration of the service-period avail theselves of at least 2 times the maximum permisible value for cows with the large milk production, determining the increase of the duration of calwing interval into the average on the population with 20.33% compared to optimum and reduction of the reproductive capacity coefficient of cows (0,87 vis-a-vis 1). The relationship between milk productivity and reproductive capacity has features according to the lactation; between the quantity of milk quantity-duration of service-period and the calwing interval persists a positive corelation althousthe low to cows IIth and IIIth lactation, weak negative correlations between the duration of the service-period-the percentage of fat at the animals of II lactation, the duration of the service-period- milk quantity and the overall fat to the cows in the IIth and IV lactation; The presence of a weak positive correlations between the CCR-average percentage of fat to the cows in lactation II, the CCR-the milk quantity to the cows of the lactation IV and the overall fat to those of lactation II and IV, the average negative between the CCR- milk quantity and -overall fat in cows from lactation II and a weak positive correlations between the CCR-average percentage of milk fat in animals of the first lactation.
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