Determination of milk production losses and variations of fat and protein percentages according to different levels of somatic cell count in Valle del Belice dairy sheep

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Abstract

The somatic cell count (SCC) of milk is widely used to monitor udder health and the milk quality and because of its positive genetic correlation with mastitis this trait was included in breeding schemes of dairy sheep. The aim of this study was to estimate the loss in milk yield (MY) and related composition resulting from different levels of somatic cell count in Valle del Belice dairy sheep. Data were collected between 2006 and 2016 in 15 flocks following an A4 recording scheme. Somatic cell count (SCC), fat and protein percentage (F% and P%) were determined using mid-infrared spectroscopy. To evaluate loss in test day MY, F% and P%, five different classes of SCC were arbitrarily defined: SCC1 ⤠500 à 103, 500 à 103< SCC2 ⤠1000 à 103, 1000 à 103< SCC3 ⤠1500 à 103, 1500 à 103< SCC4 ⤠2000 à 103and SCC5 > 2000 à 103. To estimate the loss of milk production and quality a linear model, with test day milk production traits as dependent variable, was used. Furthermore, the effect of order of parity and season of lambing were investigated to study the effects on milk production traits. Least squares means were computed for milk production traits and the differences between means were determined by Fischer's least significant difference. The estimated losses in MY according to the level of used SCC were approximately 16% whereas there was an increase of 0.06% and 0.29% for fat and protein percentage, respectively. Apart from environmental factors and management, this study confirms that high levels of somatic cell count in sheep milk are associated with milk yield losses and changes in milk composition. Results suggest that it is necessary to implement a program aimed to reduce the milk somatic cell count in ewes' milk, with the aim of improving the quality of ewes' milk and dairy products.
Lingua originaleEnglish
Numero di pagine4
RivistaSmall Ruminant Research
Stato di pubblicazionePublished - 2018

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dairy sheep
somatic cell count
milk production
Sheep
Milk
Cell Count
Fats
lipids
milk yield
Proteins
proteins
milk quality
milk
dairy products
ewes
ewe milk
environmental management
lambing
infrared spectroscopy
parity (reproduction)

All Science Journal Classification (ASJC) codes

  • Food Animals
  • Animal Science and Zoology

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title = "Determination of milk production losses and variations of fat and protein percentages according to different levels of somatic cell count in Valle del Belice dairy sheep",
abstract = "The somatic cell count (SCC) of milk is widely used to monitor udder health and the milk quality and because of its positive genetic correlation with mastitis this trait was included in breeding schemes of dairy sheep. The aim of this study was to estimate the loss in milk yield (MY) and related composition resulting from different levels of somatic cell count in Valle del Belice dairy sheep. Data were collected between 2006 and 2016 in 15 flocks following an A4 recording scheme. Somatic cell count (SCC), fat and protein percentage (F{\%} and P{\%}) were determined using mid-infrared spectroscopy. To evaluate loss in test day MY, F{\%} and P{\%}, five different classes of SCC were arbitrarily defined: SCC1 {\^a}¤ 500 {\~A} 103, 500 {\~A} 103< SCC2 {\^a}¤ 1000 {\~A} 103, 1000 {\~A} 103< SCC3 {\^a}¤ 1500 {\~A} 103, 1500 {\~A} 103< SCC4 {\^a}¤ 2000 {\~A} 103and SCC5 > 2000 {\~A} 103. To estimate the loss of milk production and quality a linear model, with test day milk production traits as dependent variable, was used. Furthermore, the effect of order of parity and season of lambing were investigated to study the effects on milk production traits. Least squares means were computed for milk production traits and the differences between means were determined by Fischer's least significant difference. The estimated losses in MY according to the level of used SCC were approximately 16{\%} whereas there was an increase of 0.06{\%} and 0.29{\%} for fat and protein percentage, respectively. Apart from environmental factors and management, this study confirms that high levels of somatic cell count in sheep milk are associated with milk yield losses and changes in milk composition. Results suggest that it is necessary to implement a program aimed to reduce the milk somatic cell count in ewes' milk, with the aim of improving the quality of ewes' milk and dairy products.",
keywords = "Animal Science and Zoology, Food Animals, Mastitis, Milk production traits, Somatic cell count, Valle del Belice sheep",
author = "{Di Gerlando}, Rosalia and Baldassare Portolano and Salvatore Mastrangelo and Sutera, {Anna Maria} and Sardina, {Maria Teresa} and Marco Tolone",
year = "2018",
language = "English",
journal = "Small Ruminant Research",
issn = "0921-4488",
publisher = "Elsevier",

}

TY - JOUR

T1 - Determination of milk production losses and variations of fat and protein percentages according to different levels of somatic cell count in Valle del Belice dairy sheep

AU - Di Gerlando, Rosalia

AU - Portolano, Baldassare

AU - Mastrangelo, Salvatore

AU - Sutera, Anna Maria

AU - Sardina, Maria Teresa

AU - Tolone, Marco

PY - 2018

Y1 - 2018

N2 - The somatic cell count (SCC) of milk is widely used to monitor udder health and the milk quality and because of its positive genetic correlation with mastitis this trait was included in breeding schemes of dairy sheep. The aim of this study was to estimate the loss in milk yield (MY) and related composition resulting from different levels of somatic cell count in Valle del Belice dairy sheep. Data were collected between 2006 and 2016 in 15 flocks following an A4 recording scheme. Somatic cell count (SCC), fat and protein percentage (F% and P%) were determined using mid-infrared spectroscopy. To evaluate loss in test day MY, F% and P%, five different classes of SCC were arbitrarily defined: SCC1 ⤠500 à 103, 500 à 103< SCC2 ⤠1000 à 103, 1000 à 103< SCC3 ⤠1500 à 103, 1500 à 103< SCC4 ⤠2000 à 103and SCC5 > 2000 à 103. To estimate the loss of milk production and quality a linear model, with test day milk production traits as dependent variable, was used. Furthermore, the effect of order of parity and season of lambing were investigated to study the effects on milk production traits. Least squares means were computed for milk production traits and the differences between means were determined by Fischer's least significant difference. The estimated losses in MY according to the level of used SCC were approximately 16% whereas there was an increase of 0.06% and 0.29% for fat and protein percentage, respectively. Apart from environmental factors and management, this study confirms that high levels of somatic cell count in sheep milk are associated with milk yield losses and changes in milk composition. Results suggest that it is necessary to implement a program aimed to reduce the milk somatic cell count in ewes' milk, with the aim of improving the quality of ewes' milk and dairy products.

AB - The somatic cell count (SCC) of milk is widely used to monitor udder health and the milk quality and because of its positive genetic correlation with mastitis this trait was included in breeding schemes of dairy sheep. The aim of this study was to estimate the loss in milk yield (MY) and related composition resulting from different levels of somatic cell count in Valle del Belice dairy sheep. Data were collected between 2006 and 2016 in 15 flocks following an A4 recording scheme. Somatic cell count (SCC), fat and protein percentage (F% and P%) were determined using mid-infrared spectroscopy. To evaluate loss in test day MY, F% and P%, five different classes of SCC were arbitrarily defined: SCC1 ⤠500 à 103, 500 à 103< SCC2 ⤠1000 à 103, 1000 à 103< SCC3 ⤠1500 à 103, 1500 à 103< SCC4 ⤠2000 à 103and SCC5 > 2000 à 103. To estimate the loss of milk production and quality a linear model, with test day milk production traits as dependent variable, was used. Furthermore, the effect of order of parity and season of lambing were investigated to study the effects on milk production traits. Least squares means were computed for milk production traits and the differences between means were determined by Fischer's least significant difference. The estimated losses in MY according to the level of used SCC were approximately 16% whereas there was an increase of 0.06% and 0.29% for fat and protein percentage, respectively. Apart from environmental factors and management, this study confirms that high levels of somatic cell count in sheep milk are associated with milk yield losses and changes in milk composition. Results suggest that it is necessary to implement a program aimed to reduce the milk somatic cell count in ewes' milk, with the aim of improving the quality of ewes' milk and dairy products.

KW - Animal Science and Zoology

KW - Food Animals

KW - Mastitis

KW - Milk production traits

KW - Somatic cell count

KW - Valle del Belice sheep

UR - http://hdl.handle.net/10447/280502

UR - http://www.elsevier.com/inca/publications/store/5/0/3/3/1/7/index.htt

M3 - Article

JO - Small Ruminant Research

JF - Small Ruminant Research

SN - 0921-4488

ER -