Modeling daily yields of milk, fat, protein, and lactose of New Zealand dairy goats undergoing standard and extended lactations

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dc.citation.issue3
dc.citation.volume107
dc.contributor.authorBoshoff M
dc.contributor.authorLopez-Villalobos N
dc.contributor.authorAndrews C
dc.contributor.authorTurner S-A
dc.coverage.spatialUnited States
dc.date.accessioned2024-10-15T01:49:18Z
dc.date.available2024-10-15T01:49:18Z
dc.date.issued2024-03
dc.description.abstractThis study aimed to assess the milk production data for New Zealand dairy goats in either a standard lactation (SL; ≤305 d in milk [DIM]) or extended lactation (EL; >305 and ≤670 DIM) using a random regression (RR) with third- and fifth-order Legendre polynomials, respectively. Persistency of EL was defined as (B/A) × 100, where A was the accumulated yield from d 1 to 305, and B was the accumulated yield from d 366 to 670. On average, goats in SL produced 1,183 kg of milk, 37 kg of fat, 37 kg of protein, and 54 kg of lactose. The average production of milk, fat, protein, and lactose in EL were 2,473 kg, 78 kg, 79 kg, and 112 kg, respectively. The average persistences for milk, fat, protein, and lactose yields during EL were 98%, 98%, 102%, and 96%, respectively. The relative prediction errors were close to 10% and the concordance correlation coefficients >0.92, indicating that the RR model with Legendre polynomials is adequate for modeling lactation curves for both SL and EL. Total yields and persistency were analyzed with a mixed model that included the fixed effects (year, month of kidding, parity, and proportion of Saanen) as covariates and the random effects of animal and residual errors. Effects of year, month of kidding, and parity were significant on the total yields of milk, fat, protein, and lactose for both SL and EL. The total milk yield of first-parity goats with SL was 946 kg and the total milk yield of second-parity goats with SL was 1,284 kg, making a total of 2,230 kg over 2 years. The total milk yield of a first-parity goat with EL was 2,140 kg. Thus, on average, a goat with SL for the first and second parity produced 90 kg more milk than a first-parity goat subjected to EL. However, a second-parity goat subjected to EL produced 43 kg more milk (2,639 kg) than a goat with SL following the second and third parity (1,284 kg + 1,312 kg). These data, along with the various other benefits of EL (e.g., fewer offspring born and reduced risk of mastitis, lameness, and metabolic problems in early lactation), indicate that EL as a management strategy holds the potential to improve dairy goat longevity and lifetime efficiency without compromising milk production.
dc.description.confidentialfalse
dc.edition.editionMarch 2024
dc.format.pagination1500-1509
dc.identifier.author-urlhttps://www.ncbi.nlm.nih.gov/pubmed/37863292
dc.identifier.citationBoshoff M, Lopez-Villalobos N, Andrews C, Turner S-A. (2024). Modeling daily yields of milk, fat, protein, and lactose of New Zealand dairy goats undergoing standard and extended lactations.. J Dairy Sci. 107. 3. (pp. 1500-1509).
dc.identifier.doi10.3168/jds.2023-23926
dc.identifier.eissn1525-3198
dc.identifier.elements-typejournal-article
dc.identifier.issn0022-0302
dc.identifier.piiS0022-0302(23)00759-2
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/71717
dc.languageeng
dc.publisherElsevier Inc on behalf of the American Dairy Science Association
dc.publisher.urihttps://www.sciencedirect.com/science/article/pii/S0022030223007592
dc.relation.isPartOfJ Dairy Sci
dc.rights(c) 2024 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectextended lactation
dc.subjectgoat
dc.subjectmilk yield
dc.subjectpersistency
dc.subjectrandom regression
dc.subjectAnimals
dc.subjectFemale
dc.subjectPregnancy
dc.subjectMilk
dc.subjectLactose
dc.subjectNew Zealand
dc.subjectLactation
dc.subjectGoats
dc.titleModeling daily yields of milk, fat, protein, and lactose of New Zealand dairy goats undergoing standard and extended lactations
dc.typeJournal article
pubs.elements-id481020
pubs.organisational-groupOther
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