Estimation of genetic parameters for production, composition and processability of milk from dairy sheep in a New Zealand flock.
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| Title: | Estimation of genetic parameters for production, composition and processability of milk from dairy sheep in a New Zealand flock. |
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| Authors: | Marshall, Ana Carolina1,2 (AUTHOR) a.c.marshall@massey.ac.nz, Lopez-Villalobos, Nicolas1 (AUTHOR), Loveday, Simon M.2,3 (AUTHOR), Weeks, Mike4 (AUTHOR), McNabb, Warren2 (AUTHOR) |
| Source: | New Zealand Journal of Agricultural Research. Oct2025, Vol. 68 Issue 5, p1107-1124. 18p. |
| Subjects: | Coagulation (Food science), Genetic correlations, Milk yield, Composition of milk, Ewes, Sheep milk |
| Abstract: | This paper aimed to estimate the heritability and genetic correlations for processability (milk coagulation properties, cheese yield, and heat stability), milk production, and milk composition of dairy sheep in a New Zealand flock. Test-day records from 169 ewes were obtained during the 2021–2022 season. Heritability estimates for yield traits (milk, fat, protein, and lactose yield) were moderate and ranged from 0.33 to 0.38. Whereas heritability estimates for processability traits were lower and ranged from 0.17 to 0.27. The genetic correlations indicated that poorer milk coagulation properties were associated with lower mammary health indicated by higher SCS, higher pH, and lower lactose content. Additionally, a higher ratio of casein to calcium i.e. lower availability of soluble calcium was associated with poorer milk coagulation properties. Higher yields of milk, fat, protein, and lactose were associated, but to a smaller degree, with better MCP. It is proposed that genetic improvement of dairy sheep for higher yields of fat and protein, and for lower SCS, could indirectly improve milk processability for cheese-making. However, it is recommended that larger studies involving more dairy sheep flocks are conducted to validate the present results before developing a selection index for this industry. [ABSTRACT FROM AUTHOR] |
| Copyright of New Zealand Journal of Agricultural Research is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 186209071 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Estimation of genetic parameters for production, composition and processability of milk from dairy sheep in a New Zealand flock. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Marshall%2C+Ana+Carolina%22">Marshall, Ana Carolina</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> a.c.marshall@massey.ac.nz</i><br /><searchLink fieldCode="AR" term="%22Lopez-Villalobos%2C+Nicolas%22">Lopez-Villalobos, Nicolas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Loveday%2C+Simon+M%2E%22">Loveday, Simon M.</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Weeks%2C+Mike%22">Weeks, Mike</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22McNabb%2C+Warren%22">McNabb, Warren</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22New+Zealand+Journal+of+Agricultural+Research%22">New Zealand Journal of Agricultural Research</searchLink>. Oct2025, Vol. 68 Issue 5, p1107-1124. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Coagulation+%28Food+science%29%22">Coagulation (Food science)</searchLink><br /><searchLink fieldCode="DE" term="%22Genetic+correlations%22">Genetic correlations</searchLink><br /><searchLink fieldCode="DE" term="%22Milk+yield%22">Milk yield</searchLink><br /><searchLink fieldCode="DE" term="%22Composition+of+milk%22">Composition of milk</searchLink><br /><searchLink fieldCode="DE" term="%22Ewes%22">Ewes</searchLink><br /><searchLink fieldCode="DE" term="%22Sheep+milk%22">Sheep milk</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This paper aimed to estimate the heritability and genetic correlations for processability (milk coagulation properties, cheese yield, and heat stability), milk production, and milk composition of dairy sheep in a New Zealand flock. Test-day records from 169 ewes were obtained during the 2021–2022 season. Heritability estimates for yield traits (milk, fat, protein, and lactose yield) were moderate and ranged from 0.33 to 0.38. Whereas heritability estimates for processability traits were lower and ranged from 0.17 to 0.27. The genetic correlations indicated that poorer milk coagulation properties were associated with lower mammary health indicated by higher SCS, higher pH, and lower lactose content. Additionally, a higher ratio of casein to calcium i.e. lower availability of soluble calcium was associated with poorer milk coagulation properties. Higher yields of milk, fat, protein, and lactose were associated, but to a smaller degree, with better MCP. It is proposed that genetic improvement of dairy sheep for higher yields of fat and protein, and for lower SCS, could indirectly improve milk processability for cheese-making. However, it is recommended that larger studies involving more dairy sheep flocks are conducted to validate the present results before developing a selection index for this industry. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of New Zealand Journal of Agricultural Research is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/00288233.2024.2368505 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 1107 Subjects: – SubjectFull: Coagulation (Food science) Type: general – SubjectFull: Genetic correlations Type: general – SubjectFull: Milk yield Type: general – SubjectFull: Composition of milk Type: general – SubjectFull: Ewes Type: general – SubjectFull: Sheep milk Type: general Titles: – TitleFull: Estimation of genetic parameters for production, composition and processability of milk from dairy sheep in a New Zealand flock. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Marshall, Ana Carolina – PersonEntity: Name: NameFull: Lopez-Villalobos, Nicolas – PersonEntity: Name: NameFull: Loveday, Simon M. – PersonEntity: Name: NameFull: Weeks, Mike – PersonEntity: Name: NameFull: McNabb, Warren IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 10 Text: Oct2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 00288233 Numbering: – Type: volume Value: 68 – Type: issue Value: 5 Titles: – TitleFull: New Zealand Journal of Agricultural Research Type: main |
| ResultId | 1 |
