Survival of Holstein Friesian heifers through to fourth calving on a research farm.

This study monitored survival up to fourth calving and reasons to culling of a number of 202 Holstein Friesian heifers on research farm at Agricultural Research and Development Station (ARDS) Simnic, Craiova. Heifers born between 2016 and 2019 were monitored from 1 months of age trough to forth calv...

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Autores principales:	Gavan Constantin, Mihaela Riza
Formato:	article
Lenguaje:	EN
Publicado:	Agroprint Timisoara 2021
Materias:	culling, longevity traits, survival. Agriculture S Technology T Science Q
Acceso en línea:	https://doaj.org/article/0ed802619310420ba927acdb36715857
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spelling	oai:doaj.org-article:0ed802619310420ba927acdb367158572021-11-04T07:45:45ZSurvival of Holstein Friesian heifers through to fourth calving on a research farm.1841-93642344-4576https://doaj.org/article/0ed802619310420ba927acdb367158572021-10-01T00:00:00Zhttps://spasb.ro/index.php/spasb/article/view/2747https://doaj.org/toc/1841-9364https://doaj.org/toc/2344-4576This study monitored survival up to fourth calving and reasons to culling of a number of 202 Holstein Friesian heifers on research farm at Agricultural Research and Development Station (ARDS) Simnic, Craiova. Heifers born between 2016 and 2019 were monitored from 1 months of age trough to forth calving. The survival of animals was calculated during 4 lifetime phases: (1) rearing period; (2) lactation 1; (3) lactation 2; (4) lactation 3. Also 4 longevity traits were calculated for all animals culled before forth calving: (1) age to culling; (2) herd life; (3) total lifetime days in milk (DIM); and 4 longevity index. During the rearing period 6.9% of the total heifers at 1 month did not survive until first calving (0% longevity index). Of those that did calve (n = 188), 12.7% were culled in lactation 1, with a longevity index of 28.4%. In the second lactation 15.2% of the cows that did calve for the second time (n = 164) were culled, with a longevity index of 44%, and in the third lactation 19.4% of the cows that did calve for the third time (n = 139) were culled with a longevity index of 53.5%. Of all animals recruited at 1 month of age 55.4% (n = 112/202) calved for a fourth time. The primary cause for culling was infertility. These results show that some of heifers never become productive or are culled before they reach their full lactation potential.Gavan ConstantinMihaela RizaAgroprint Timisoaraarticleculling, longevity traits, survival.AgricultureSTechnologyTScienceQENScientific Papers Animal Science and Biotechnologies, Vol 54, Iss 2, Pp 38-41 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	culling, longevity traits, survival. Agriculture S Technology T Science Q
spellingShingle	culling, longevity traits, survival. Agriculture S Technology T Science Q Gavan Constantin Mihaela Riza Survival of Holstein Friesian heifers through to fourth calving on a research farm.
description	This study monitored survival up to fourth calving and reasons to culling of a number of 202 Holstein Friesian heifers on research farm at Agricultural Research and Development Station (ARDS) Simnic, Craiova. Heifers born between 2016 and 2019 were monitored from 1 months of age trough to forth calving. The survival of animals was calculated during 4 lifetime phases: (1) rearing period; (2) lactation 1; (3) lactation 2; (4) lactation 3. Also 4 longevity traits were calculated for all animals culled before forth calving: (1) age to culling; (2) herd life; (3) total lifetime days in milk (DIM); and 4 longevity index. During the rearing period 6.9% of the total heifers at 1 month did not survive until first calving (0% longevity index). Of those that did calve (n = 188), 12.7% were culled in lactation 1, with a longevity index of 28.4%. In the second lactation 15.2% of the cows that did calve for the second time (n = 164) were culled, with a longevity index of 44%, and in the third lactation 19.4% of the cows that did calve for the third time (n = 139) were culled with a longevity index of 53.5%. Of all animals recruited at 1 month of age 55.4% (n = 112/202) calved for a fourth time. The primary cause for culling was infertility. These results show that some of heifers never become productive or are culled before they reach their full lactation potential.
format	article
author	Gavan Constantin Mihaela Riza
author_facet	Gavan Constantin Mihaela Riza
author_sort	Gavan Constantin
title	Survival of Holstein Friesian heifers through to fourth calving on a research farm.
title_short	Survival of Holstein Friesian heifers through to fourth calving on a research farm.
title_full	Survival of Holstein Friesian heifers through to fourth calving on a research farm.
title_fullStr	Survival of Holstein Friesian heifers through to fourth calving on a research farm.
title_full_unstemmed	Survival of Holstein Friesian heifers through to fourth calving on a research farm.
title_sort	survival of holstein friesian heifers through to fourth calving on a research farm.
publisher	Agroprint Timisoara
publishDate	2021
url	https://doaj.org/article/0ed802619310420ba927acdb36715857
work_keys_str_mv	AT gavanconstantin survivalofholsteinfriesianheifersthroughtofourthcalvingonaresearchfarm AT mihaelariza survivalofholsteinfriesianheifersthroughtofourthcalvingonaresearchfarm
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Survival of Holstein Friesian heifers through to fourth calving on a research farm.

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