Age at first calving and productive performance of primiparous Holsteins

This study investigated the age at first calving in Holstein heifers and its impact on various production parameters. A sample of 737 Holstein heifers born between 2015 and 2018 and finishing their first lactations between 2018 and 2020 was included. Cluster analysis revealed three groups based on a...

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Published in:Journal of dairy research 2023-11, Vol.90 (4), p.353-356
Main Authors: Braganholo, Rafael Ceolim, Bánkuti, Ferenc Istvan, dos Santos, Fabio Seiji, Pedrosa, Victor Breno, Zambom, Maximiliane Alavarse, Valloto, Altair Antônio, dos Santos, Geraldo Tadeu
Format: Article
Language:English
Subjects:
Age
Animal lactation
Animals
Cattle
Classification
Cluster analysis
Corn
Costs
Farms
Female
Lactation
Milk
Milk - chemistry
Milk production
Milk Proteins - analysis
Parity
Parturition
Pregnancy
Proteins
Software
Variables
Variance analysis
Weaning
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container_end_page 356
container_issue 4
container_start_page 353
container_title Journal of dairy research
container_volume 90
creator Braganholo, Rafael Ceolim
Bánkuti, Ferenc Istvan
dos Santos, Fabio Seiji
Pedrosa, Victor Breno
Zambom, Maximiliane Alavarse
Valloto, Altair Antônio
dos Santos, Geraldo Tadeu
description This study investigated the age at first calving in Holstein heifers and its impact on various production parameters. A sample of 737 Holstein heifers born between 2015 and 2018 and finishing their first lactations between 2018 and 2020 was included. Cluster analysis revealed three groups based on age at first calving: high precocity, medium precocity and low precocity. Medium-precocity group exhibited the highest 305-day milk yield and peak milk production. Additionally, the same group demonstrated superior mean production per lactation, 305-day milk protein content, and 305-day milk yield. The lowest somatic cell count was found in the low-precocity group. In conclusion, medium-precocity cows showed better results such as higher 305-day milk yield and peak milk production.
doi_str_mv 10.1017/S0022029923000729
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source Cambridge Journals Online
subjects Age
Animal lactation
Animals
Cattle
Classification
Cluster analysis
Corn
Costs
Farms
Female
Lactation
Milk
Milk - chemistry
Milk production
Milk Proteins - analysis
Parity
Parturition
Pregnancy
Proteins
Software
Variables
Variance analysis
Weaning
title Age at first calving and productive performance of primiparous Holsteins
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