The Deviation between Dairy Cow Metabolizable Energy Requirements and Pasture Supply on a Dairy Farm Using Proximal Hyperspectral Sensing
نویسندگان
چکیده
This study aimed at determining the extent to which deviation of daily total metabolizable energy (MEt) requirements individual cows from (ME) supplied per cow (DME) varied throughout production season in a pasture-based dairy farm using proximal hyperspectral sensing (PHS). Herd tests, milk production, herbage and feed allocation data were collected during 2016–2017 2017–2018 seasons Dairy 1, Massey University, New Zealand. Herbage ME was determined canopy reflectance acquired PHS. Orthogonal polynomials used model lactation curves for yields milk, fat, protein live weights cows. Daily dietary herd calculated Agricultural Food Research Council (AFRC) system 1993. A linear including random effects breed estimate variance components DME. MEt estimated oscillated between fifth above or below seasons. DME mostly explained by observations made within rather than breeds. Having estimates addition supply can potentially contribute achieving more precise fit demand devising feeding strategies reducing
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ژورنال
عنوان ژورنال: Agriculture
سال: 2021
ISSN: ['2077-0472']
DOI: https://doi.org/10.3390/agriculture11030240