Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactation
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Semina. Ciências Agrárias (Online) |
Texto Completo: | https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/2603 |
Resumo: | In order to assess the influence of the colostrum period on pH and, electrical conductivity, we collected 418 milk samples from 127 Jersey cows. The samples were collected from healthy udders that did not present any bacterial growth in the microbiological examination. They were divided into eight groups as follows < 1/2 day; 1/2 and 1º day; 2º day; 3º day; 4º and 5º day; 6º and 7º day; 8º to 15º day; 16º to 30º days of lactation. The samples were collected before milking and the following analyses were conducted: pH, electrical conductivity. In the first 24 hours of lactation, there was an reduction in electrical conductivity value, associated with an increase in pH value. We observed that transition of secretion from colostrums to milk, occurs during the first week of lactation; from 6 rd day of lactation for pH value and 3th day for electrical conductivity value. We recommend the use the following figures as normal ranges for the first 24 hours of lactation (colostrum period): pH ? 6,51 and electrical conductivity ? 6,33 mS/cm; while for the interval between 2nd and 7 th days of lactation (transition from colostrum to milk) we suggest the use of the values as normal ranges: pH ? 6,66 and electrical conductivity ? 5,93 mS/cm. |
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Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactationAvaliação do pH e da eletrocondutividade do leite de bovinos da raça Jersey durante o primeiro mês de lactaçãoMilkpHElectrical conductivityCattleJersey breed.LeitepHEletrocondutividadeBovinosRaça Jersey.In order to assess the influence of the colostrum period on pH and, electrical conductivity, we collected 418 milk samples from 127 Jersey cows. The samples were collected from healthy udders that did not present any bacterial growth in the microbiological examination. They were divided into eight groups as follows < 1/2 day; 1/2 and 1º day; 2º day; 3º day; 4º and 5º day; 6º and 7º day; 8º to 15º day; 16º to 30º days of lactation. The samples were collected before milking and the following analyses were conducted: pH, electrical conductivity. In the first 24 hours of lactation, there was an reduction in electrical conductivity value, associated with an increase in pH value. We observed that transition of secretion from colostrums to milk, occurs during the first week of lactation; from 6 rd day of lactation for pH value and 3th day for electrical conductivity value. We recommend the use the following figures as normal ranges for the first 24 hours of lactation (colostrum period): pH ? 6,51 and electrical conductivity ? 6,33 mS/cm; while for the interval between 2nd and 7 th days of lactation (transition from colostrum to milk) we suggest the use of the values as normal ranges: pH ? 6,66 and electrical conductivity ? 5,93 mS/cm.Com o objetivo de avaliar a influência do período colostral no pH e na eletrocondutividade foram colhidas 418 amostras de leite provenientes de mamas sadias de 127 vacas da raça Jersey e que não apresentem crescimento bacteriano no exame microbiológico. As amostras foram divididas em oito grupos a seguir discriminados: < 1/2 dia; 1/2 a 1º dia; 2º dia; 3º dia; 4º e 5º dia; 6º e 7º dia; 8º ao 15º dia; 16ºao 30º dia em lactação.As amostras foram colhidas antes da ordenha, sendo as seguintes determinações realizadas: pH e eletrocondutividade. Durante a fase colostral o valor de pH aumentou até atingir os valores considerados normais para o leite enquanto o valor da eletrocondutividade diminuiu, sendo que a transição da secreção de colostro para leite ocorreu na primeira semana de lactação. Recomenda-se nas primeiras 24 horas de lactação (período colostral) a adoção dos seguintes limites de normalidade: pH ? 6,51 e eletrocondutividade ? 6,33 mS/cm;. enquanto para o período entre o 2º e 7º dia de lactação (transição de colostro para leite) recomenda-se a adoção dos seguintes limites de normalidade: pH ?6,66 e eletrocondutividade ? 5,93 S/cm.UEL2009-07-21info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/260310.5433/1679-0359.2009v30n2p447Semina: Ciências Agrárias; Vol. 30 No. 2 (2009); 447-456Semina: Ciências Agrárias; v. 30 n. 2 (2009); 447-4561679-03591676-546Xreponame:Semina. Ciências Agrárias (Online)instname:Universidade Estadual de Londrina (UEL)instacron:UELporhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/2603/2258Raimondo, Raquel Fraga e SilvaBrandespim, Flavio BracalePrina, Ana Paula MazuccoBirgel Junior, Eduardo Harryinfo:eu-repo/semantics/openAccess2015-11-19T18:38:36Zoai:ojs.pkp.sfu.ca:article/2603Revistahttp://www.uel.br/revistas/uel/index.php/semagrariasPUBhttps://ojs.uel.br/revistas/uel/index.php/semagrarias/oaisemina.agrarias@uel.br1679-03591676-546Xopendoar:2015-11-19T18:38:36Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL)false |
dc.title.none.fl_str_mv |
Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactation Avaliação do pH e da eletrocondutividade do leite de bovinos da raça Jersey durante o primeiro mês de lactação |
title |
Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactation |
spellingShingle |
Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactation Raimondo, Raquel Fraga e Silva Milk pH Electrical conductivity Cattle Jersey breed. Leite pH Eletrocondutividade Bovinos Raça Jersey. |
title_short |
Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactation |
title_full |
Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactation |
title_fullStr |
Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactation |
title_full_unstemmed |
Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactation |
title_sort |
Evaluation of the pH and electrical conductivity in milk from jersey cows during the first month of lactation |
author |
Raimondo, Raquel Fraga e Silva |
author_facet |
Raimondo, Raquel Fraga e Silva Brandespim, Flavio Bracale Prina, Ana Paula Mazucco Birgel Junior, Eduardo Harry |
author_role |
author |
author2 |
Brandespim, Flavio Bracale Prina, Ana Paula Mazucco Birgel Junior, Eduardo Harry |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Raimondo, Raquel Fraga e Silva Brandespim, Flavio Bracale Prina, Ana Paula Mazucco Birgel Junior, Eduardo Harry |
dc.subject.por.fl_str_mv |
Milk pH Electrical conductivity Cattle Jersey breed. Leite pH Eletrocondutividade Bovinos Raça Jersey. |
topic |
Milk pH Electrical conductivity Cattle Jersey breed. Leite pH Eletrocondutividade Bovinos Raça Jersey. |
description |
In order to assess the influence of the colostrum period on pH and, electrical conductivity, we collected 418 milk samples from 127 Jersey cows. The samples were collected from healthy udders that did not present any bacterial growth in the microbiological examination. They were divided into eight groups as follows < 1/2 day; 1/2 and 1º day; 2º day; 3º day; 4º and 5º day; 6º and 7º day; 8º to 15º day; 16º to 30º days of lactation. The samples were collected before milking and the following analyses were conducted: pH, electrical conductivity. In the first 24 hours of lactation, there was an reduction in electrical conductivity value, associated with an increase in pH value. We observed that transition of secretion from colostrums to milk, occurs during the first week of lactation; from 6 rd day of lactation for pH value and 3th day for electrical conductivity value. We recommend the use the following figures as normal ranges for the first 24 hours of lactation (colostrum period): pH ? 6,51 and electrical conductivity ? 6,33 mS/cm; while for the interval between 2nd and 7 th days of lactation (transition from colostrum to milk) we suggest the use of the values as normal ranges: pH ? 6,66 and electrical conductivity ? 5,93 mS/cm. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-07-21 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/2603 10.5433/1679-0359.2009v30n2p447 |
url |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/2603 |
identifier_str_mv |
10.5433/1679-0359.2009v30n2p447 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://ojs.uel.br/revistas/uel/index.php/semagrarias/article/view/2603/2258 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
UEL |
publisher.none.fl_str_mv |
UEL |
dc.source.none.fl_str_mv |
Semina: Ciências Agrárias; Vol. 30 No. 2 (2009); 447-456 Semina: Ciências Agrárias; v. 30 n. 2 (2009); 447-456 1679-0359 1676-546X reponame:Semina. Ciências Agrárias (Online) instname:Universidade Estadual de Londrina (UEL) instacron:UEL |
instname_str |
Universidade Estadual de Londrina (UEL) |
instacron_str |
UEL |
institution |
UEL |
reponame_str |
Semina. Ciências Agrárias (Online) |
collection |
Semina. Ciências Agrárias (Online) |
repository.name.fl_str_mv |
Semina. Ciências Agrárias (Online) - Universidade Estadual de Londrina (UEL) |
repository.mail.fl_str_mv |
semina.agrarias@uel.br |
_version_ |
1799306058592681984 |