Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile

Abstract: In Chile, most dairy cattle are located in the southern region of the country, where the largest volume of milk is produced. This study aimed to quantify changes of somatic cell count (SCC) over 20 years in 11 herds of the Los Ríos region and to assess the effect of parity number, days in...

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Autores principales:	Sebastino,Kiala B., Uribe,Héctor, González,Humberto H.
Lenguaje:	English
Publicado:	Universidad Austral de Chile. Facultad de Ciencias Veterinarias 2020
Materias:	milk test day mastitis microbiological quality of milk
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322020000100102
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spelling	oai:scielo:S0719-813220200001001022020-01-30Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in ChileSebastino,Kiala B.Uribe,HéctorGonzález,Humberto H. milk test day mastitis microbiological quality of milk Abstract: In Chile, most dairy cattle are located in the southern region of the country, where the largest volume of milk is produced. This study aimed to quantify changes of somatic cell count (SCC) over 20 years in 11 herds of the Los Ríos region and to assess the effect of parity number, days in milk, milk yield, and milk fat and protein content on SCC. A database of approximately 277,709 observations based on 10,363 cows from 11 herds of the area was used. Data were gathered from 1998 to 2018. Outliers and inconsistent observations were eliminated. Multiple linear regression was used to model SCC on fixed variables such as test year, parity number, test season, and stage of lactation; covariables included in the model were milk yield, milk fat and protein yields, and milk urea concentration. There were statistically significant associations among SCC and all independent variables included in the model. Regarding parity number and stage of lactation, they increased along with SCC. SCC was higher in warmer months and, as SCC increased, the yield decreased. It was concluded that as test year increased, SCC decreased, indicating that the mammary gland health improved and the quality of the milk was better.info:eu-repo/semantics/openAccessUniversidad Austral de Chile. Facultad de Ciencias VeterinariasAustral journal of veterinary sciences v.52 n.1 20202020-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322020000100102en10.4067/S0719-81322020000100102
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	milk test day mastitis microbiological quality of milk
spellingShingle	milk test day mastitis microbiological quality of milk Sebastino,Kiala B. Uribe,Héctor González,Humberto H. Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile
description	Abstract: In Chile, most dairy cattle are located in the southern region of the country, where the largest volume of milk is produced. This study aimed to quantify changes of somatic cell count (SCC) over 20 years in 11 herds of the Los Ríos region and to assess the effect of parity number, days in milk, milk yield, and milk fat and protein content on SCC. A database of approximately 277,709 observations based on 10,363 cows from 11 herds of the area was used. Data were gathered from 1998 to 2018. Outliers and inconsistent observations were eliminated. Multiple linear regression was used to model SCC on fixed variables such as test year, parity number, test season, and stage of lactation; covariables included in the model were milk yield, milk fat and protein yields, and milk urea concentration. There were statistically significant associations among SCC and all independent variables included in the model. Regarding parity number and stage of lactation, they increased along with SCC. SCC was higher in warmer months and, as SCC increased, the yield decreased. It was concluded that as test year increased, SCC decreased, indicating that the mammary gland health improved and the quality of the milk was better.
author	Sebastino,Kiala B. Uribe,Héctor González,Humberto H.
author_facet	Sebastino,Kiala B. Uribe,Héctor González,Humberto H.
author_sort	Sebastino,Kiala B.
title	Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile
title_short	Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile
title_full	Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile
title_fullStr	Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile
title_full_unstemmed	Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile
title_sort	effect of test year, parity number and days in milk on somatic cell count in dairy cows of los ríos region in chile
publisher	Universidad Austral de Chile. Facultad de Ciencias Veterinarias
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322020000100102
work_keys_str_mv	AT sebastinokialab effectoftestyearparitynumberanddaysinmilkonsomaticcellcountindairycowsoflosriosregioninchile AT uribehector effectoftestyearparitynumberanddaysinmilkonsomaticcellcountindairycowsoflosriosregioninchile AT gonzalezhumbertoh effectoftestyearparitynumberanddaysinmilkonsomaticcellcountindairycowsoflosriosregioninchile
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Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile

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