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

Sutera, Anna Maria; Portolano, Baldassare; Gerlando, Rosalia Di; Sardina, Maria Teresa; Mastrangelo, Salvatore; Tolone, Marco

doi:10.1016/j.smallrumres.2018.03.002

Cited by 18 publications

(12 citation statements)

References 27 publications

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“…The peak of production is related to the lactose content for Santa Ines ewes, reported the major level of production at 37 DIM 7 . This is correlated with found here for lactose content which was higher in group two (21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40); also, the results of this study are similar to reported by others 29 , who correlated the percentage of lactose and production peak, and found that this occurred in the third week (21 DIM) for Talaverana breed.…”

Section: Discussionsupporting

confidence: 92%

Características fisicoquímicas de la leche cruda en ovejas de Boyacá, Colombia

2021

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La calidad de la leche cruda de las ovejas es un factor muy importante a tener en cuenta cuando se escogen las mejores hembras para los sistemas productivos ovinos, porque el rango de crecimiento de los corderos está altamente relacionado con ello. El objetivo de este trabajo fue determinar las características fisicoquímicas de la leche cruda de ovejas de raza Dorper a través de los días en lactancia. Los parámetros evaluados fueron: porcentaje de grasa, proteína, lactosa, sólidos totales, sólidos no grasos y punto de congelación expresado en grados centígrados. Los animales fueron organizados en tres grupos de acuerdo a sus días en lactancia (3-20 días, 21-40 días y 41-60 días, con 40 ovejas por grupo). El análisis de la leche fue realizado usando un MilkoScanMars®. El recuento de células somáticas fue efectuado con un equipo Portacheck para cabras. Se realizó un ANOVA para determinar las diferencias estadísticas entre los grupos para cada parámetro (p<0,05). No hubo diferencias estadísticas para grasa, sólidos no grasos y sólidos totales; los otros parámetros tuvieron diferencias estadísticas. Los mejores resultados fueron grasa: 8.09% (grupo 2), proteína: 5.45% (grupo 1), lactosa: 5.22% (grupo 2), sólidos no grasos: 11.13% (grupo 1), sólidos totales: 19.17% (grupo 2), punto de congelación -0.5836ºC (grupo 1) y recuento de células somáticas: 75.3 x 1000 cel./ml (grupo 2). Los resultados de las características fisicoquímicas de la leche cruda de ovejas Dorper fueron mejores comparados con otras razas (lecheras o cárnicas).

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Section: Discussionsupporting

confidence: 92%

Características fisicoquímicas de la leche cruda en ovejas de Boyacá, Colombia

2021

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“… Kelly et al (2000) found that an elevated SCC can alter the protein fractions distribution; decrease casein and lactose levels in milk; increase rennet clotting time, cheese moisture, and losses of fat and proteins in whey, and reduce curd firmness and cheese yielding. A study conducted by Sutera et al (2018) confirmed that high levels of SCC in sheep milk are associated with milk yield losses and variations of fat and protein percentages. The estimated losses in milk yield ranged from 883 g for SCC ≤ 2,000 × 10 3 to 1,052 g for SCC ≤ 500 × 10 3 with an overall decrease of 16%, whereas fat and protein percentages increased to 0.06 and 0.29%, respectively.…”

Section: Introductionmentioning

confidence: 89%

Genome-Wide Association Study Identifies New Candidate Markers for Somatic Cells Score in a Local Dairy Sheep

et al. 2021

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In the Mediterranean basin countries, the dairy sheep production is usually based on local breeds, which are very well-adapted to their production systems and environments and can indeed guarantee income, employment, and economic viability in areas where production alternatives are scarce or non-existent. Mastitis is still one of the greatest problems affecting commercial milk production. However, genetic evaluation of mastitis is particularly difficult because of its low heritability and the categorical nature of the trait. The aim of this study was to identify genomic regions putatively associated with somatic cells count (SCC) in the local economically important Valle del Belice sheep breed using of deregressed breeding values (DEBV) as response variables. All the samples were genotyped using the Illumina OvineSNP50K BeadChip. Genome-wide association analysis was carried out based on regression of DEBV. A total of eight markers were found to be significantly associated with log-transformed SCC. Several candidate genes associated with SCC were identified related to immunity system and udder conformation. The results can help improving the competitiveness of the local Valle del Belìce breed. Further studies considering a higher sample size or independent population will be needed to confirm our results.

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“…In a sheep flock with 75% infected glands, a decrease in production of 12.2% was observed [1], whereas in goats, with the same percentage of infected glands, the losses were 2.3%. A production loss related to the increase in SCC was also reported [2], reaching 16% when the threshold of 500 × 103 cells/mL was exceeded, emphasising the importance of implementing SCC control programmes in sheep. Mastitis also causes an alteration in milk composition and a consequent decrease in cheese yield, more pronounced in sheep than in cattle or goats [3].…”

Section: Introductionmentioning

confidence: 92%

Effect of the Onset of Intramammary Infection on the Electrical Conductivity of Ewe’s Milk and Study of Various Algorithms for Its On-Line Detection

Roca

Muelas

Alejandro³

et al. 2023

Animals

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The aim of this study was to determine the effect of the onset of intramammary infection (IMI) on the electrical conductivity (EC) of ewe milk and assess the detection capability of various algorithms based on daily glandular milk EC measurement. An experiment was carried out with 26 Manchega sheep located at the farm of the Miguel Hernández University, Elche, Spain. The variables in milk from the gland (production, EC) were monitored daily for 2 weeks during the morning and evening milking; once infection was established in the gland, the variables were measured for a further 4 weeks. In addition, the SCC, sodium, potassium, chloride and milk macro-compositions were analysed. The sensitivity, specificity and positive and negative predictive values for IMI detection of different algorithms were calculated using the EC variable. It was observed that the onset of IMI resulted in an increase in SCC and a significant decrease in yield, and EC rose significantly when infection occurred bilaterally. The best results for IMI detection were obtained with the algorithm that detected deviations greater than 3σ of the conductivity ratio between collateral glands with respect to a moving average calculated with a time horizon of 10 days (50% sensitivity and 100% specificity).

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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

Cited by 18 publications

References 27 publications

Características fisicoquímicas de la leche cruda en ovejas de Boyacá, Colombia

Características fisicoquímicas de la leche cruda en ovejas de Boyacá, Colombia

Genome-Wide Association Study Identifies New Candidate Markers for Somatic Cells Score in a Local Dairy Sheep

Effect of the Onset of Intramammary Infection on the Electrical Conductivity of Ewe’s Milk and Study of Various Algorithms for Its On-Line Detection

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