<abstract xmlns="http://www.w3.org/1999/xhtml"><p> We researched the influence of two methods of housing primiparous cows on meeting estimated energy requirements. In herd A primiparous cows were kept in a separate technological group during the whole lactation period, whereas in herd B they were kept in technological groups together with multigravid cows. The whole herd A consisted of 400 cows, where the average annual yield was 10,200 kg of milk per cow. Herd B consisted of 250 cows, where the average annual yield was 8,500 kg of milk per cow. In 2010 and 2011 there were 200 primiparous cows in herd A, whereas in herd B there were 165 primiparous cows. The milk yield for 100 and 305 days of lactation was analysed. Meeting the cows’ demand for energy was determined on the basis of the percentage of protein in milk. In both herds primiparous cows were divided into milk yield classes for 100 days of lactation. Both the trend and the amount of variation in the content of protein in milk were found to be identical in both herds. The content of protein in milk increased as the milk yield decreased. This regularity could be observed at both lactation stages under analysis and the differences between the classes were statistically confirmed. During the first 100 days of lactation the estimated energy deficit comprised a much larger percentage of the cows than in the 305-day lactation period. The system of maintenance of primiparous cows (separately or together with multigravid cows) was not found to influence the milk yield or the estimated demand for energy</p></abstract>

We researched the influence of two methods of housing primiparous cows on meeting estimated energy requirements. In herd A primiparous cows were kept in a separate technological group during the whole lactation period, whereas in herd B they were kept in technological groups together with multigravid cows. The whole herd A consisted of 400 cows, where the average annual yield was 10,200 kg of milk per cow. Herd B consisted of 250 cows, where the average annual yield was 8,500 kg of milk per cow. In 2010 and 2011 there were 200 primiparous cows in herd A, whereas in herd B there were 165 primiparous cows. The milk yield for 100 and 305 days of lactation was analysed. Meeting the cows’ demand for energy was determined on the basis of the percentage of protein in milk. In both herds primiparous cows were divided into milk yield classes for 100 days of lactation. Both the trend and the amount of variation in the content of protein in milk were found to be identical in both herds. The content of protein in milk increased as the milk yield decreased. This regularity could be observed at both lactation stages under analysis and the differences between the classes were statistically confirmed. During the first 100 days of lactation the estimated energy deficit comprised a much larger percentage of the cows than in the 305-day lactation period. The system of maintenance of primiparous cows (separately or together with multigravid cows) was not found to influence the milk yield or the estimated demand for energy

Comparison of Two Methods of Housing Primiparous Cows

Institute of Technology and Life Sciences in Falenty, Poznań Branch, Biskupińska 67, 60-463 Poznań, Poland

Poznań University Life Sciences, Department of Genetics and Animal Breeding, Wołyńska 33, 60-637 Poznań, Poland

Annals of Animal Science

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

{"article-title":"Comparison of Two Methods of Housing Primiparous Cows"}

We researched the influence of two methods of housing primiparous cows on meeting estimated energy requirements. In herd A primiparous cows were kept in a...

Comparison of Two Methods of Housing Primiparous Cows

Pubblicato online: 25 apr 2014

Pagine: 405 - 415

Ricevuto: 23 lug 2013

Accettato: 13 nov 2013

DOI: https://doi.org/10.2478/aoas-2014-0019

Parole chiave
primiparous cow, housing system, milk yield, energy demand

© by Jerzy Lech Jugowar

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Comparison of Two Methods of Housing Primiparous Cows

Pubblicato online: 25 apr 2014

Pagine: 405 - 415

Ricevuto: 23 lug 2013

Accettato: 13 nov 2013

DOI: https://doi.org/10.2478/aoas-2014-0019

Parole chiaveprimiparous cow, housing system, milk yield, energy demand

© by Jerzy Lech Jugowar

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Parole chiave
primiparous cow, housing system, milk yield, energy demand