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

Sebastino, Kiala B.; Uribe, Héctor; González, Humberto H.

dc.creator	Sebastino, Kiala B.
dc.creator	Uribe, Héctor
dc.creator	González, Humberto H.
dc.date	2020-04-21
dc.date.accessioned	2020-07-14T19:03:35Z
dc.date.available	2020-07-14T19:03:35Z
dc.identifier	http://revistas.uach.cl/index.php/australjvs/article/view/6040
dc.identifier	10.4067/S0719-81322020000100102
dc.identifier.uri	https://revistaschilenas.uchile.cl/handle/2250/143633
dc.description	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.	en-US
dc.description	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.	es-ES
dc.format	application/pdf
dc.language	eng
dc.publisher	Facultad de Ciencias Veterinarias - Universidad Austral de Chile	es-ES
dc.relation	http://revistas.uach.cl/index.php/australjvs/article/view/6040/7155
dc.rights	Derechos de autor 2020 Austral Journal of Veterinary Sciences	es-ES
dc.source	Austral Journal of Veterinary Sciences; Vol. 52 Núm. 1 (2020); 1-7	en-US
dc.source	Austral Journal of Veterinary Sciences; Vol. 52 Núm. 1 (2020); 1-7	es-ES
dc.source	0719-8132
dc.source	0719-8000
dc.title	Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile	en-US
dc.title	Effect of test year, parity number and days in milk on somatic cell count in dairy cows of Los Ríos region in Chile	es-ES
dc.type	info:eu-repo/semantics/article
dc.type	info:eu-repo/semantics/publishedVersion

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