Effects of Increased Growth Rates Prior to the First Breeding as Ewe Lambs and Pregnancy Rank on Mammary Glands of Two-Year-Old Ewes

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dc.citation.issue2
dc.citation.volume1
dc.contributor.authorHaslin E
dc.contributor.authorCorner-Thomas RA
dc.contributor.authorKenyon PR
dc.contributor.authorMorris ST
dc.contributor.authorBlair HT
dc.contributor.editorIspierto IG
dc.date.accessioned2024-07-01T02:29:14Z
dc.date.available2024-07-01T02:29:14Z
dc.date.issued2021-12-01
dc.description.abstractThis study investigated potential carry-over effects of increased growth rates prior to breeding at seven months of age on mammary glands of two-year-old ewes bearing one or two lambs, and examined the association between ewe mammary structures and the growth of their progeny. Ewe live weight and mammary ultrasound measures were recorded at 119 days of pregnancy, 29 days of lactation (L29), and weaning of the progeny (L79) in 64 two-year-old ewes selected from two treatments. The heavy group (n = 32) was preferentially fed prior to their first breeding at seven months of age, achieving an average live weight of 47.9 ± 0.38 kg. The control group (n = 32) weighed an average of 44.9 ± 0.49 kg at breeding. Lambs (n = 74) were weighed at birth, L29 and L79. Udder ultrasound measures did not differ (p > 0.10) between treatments, indicating no carry-over effects of treatments on mammary glands of two-year-old ewes. The association between ultrasound measures and lamb growth seemed to differ depending on lamb birth rank. More research is needed to further investigate these associations and determine whether ultrasonography could be used to identify ewes whose progeny would have greater growth rates based on birth rank.
dc.description.confidentialfalse
dc.edition.editionDecember 2021
dc.format.pagination72-86
dc.identifier.citationHaslin E, Corner-Thomas RA, Kenyon PR, Morris ST, Blair HT. (2021). Effects of Increased Growth Rates Prior to the First Breeding as Ewe Lambs and Pregnancy Rank on Mammary Glands of Two-Year-Old Ewes. Ruminants. 1. 2. (pp. 72-86).
dc.identifier.doi10.3390/ruminants1020006
dc.identifier.eissn2673-933X
dc.identifier.elements-typejournal-article
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/70049
dc.languageEnglish
dc.publisherMDPI (Basel, Switzerland)
dc.publisher.urihttps://www.mdpi.com/2673-933X/1/2/6
dc.relation.isPartOfRuminants
dc.subjectgland cistern
dc.subjectfat pad
dc.subjectparenchyma
dc.subjectultrasound
dc.subjectsingle lamb
dc.subjecttwin lambs
dc.titleEffects of Increased Growth Rates Prior to the First Breeding as Ewe Lambs and Pregnancy Rank on Mammary Glands of Two-Year-Old Ewes
dc.typeJournal article
pubs.elements-id488573
pubs.organisational-groupOther
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