Effect of Holstein Genotype and Energy Balance on Lipids, Carnitine and Short-Chain Carboxylic Acids in Milk During Early Lactation DOI Open Access
Feng Ding, W.J. Weber, Rui Su

и другие.

Deleted Journal, Год журнала: 2025, Номер 2(1), С. 6 - 6

Опубликована: Март 11, 2025

Background: Genetic selection and improved nutrition management practices have transformed the Holstein cow. Objectives: This study examined impacts of 50 years on milk composition during early lactation by comparing from contemporary Holsteins (CH) a unique population unselected (UH) that produce less than half as much their CH herdmates. Methods: Multiparous UH cows (n = 12/genotype) were housed in same facility, fed diets subjected to procedures. Milk samples collected weekly through week 9 lactation. The proximate was determined infrared spectroscopy its lipidome liquid chromatography–mass spectrometry structural analysis. Data analyzed repeated measures using mixed-model procedures with effect. Results: An energy balance nadir occurred at 1 for but more severe (−4.5 vs. −14.8 Mcal net per day, respectively) cows. Lipidomic comparison most abundant triacylglycerols (TAGs) revealed had TAGs least two preformed fatty acids fewer de novo synthesized milk. Fatty acid analysis increase responsible different TAG profiles Furthermore, contained free carnitine, short-chain acylcarnitines lactic butyric 3-hydroxybutyric Conclusions: These results demonstrate differences primarily between genotypes

Язык: Английский

Effect of Holstein Genotype and Energy Balance on Lipids, Carnitine and Short-Chain Carboxylic Acids in Milk During Early Lactation DOI Open Access
Feng Ding, W.J. Weber, Rui Su

и другие.

Deleted Journal, Год журнала: 2025, Номер 2(1), С. 6 - 6

Опубликована: Март 11, 2025

Background: Genetic selection and improved nutrition management practices have transformed the Holstein cow. Objectives: This study examined impacts of 50 years on milk composition during early lactation by comparing from contemporary Holsteins (CH) a unique population unselected (UH) that produce less than half as much their CH herdmates. Methods: Multiparous UH cows (n = 12/genotype) were housed in same facility, fed diets subjected to procedures. Milk samples collected weekly through week 9 lactation. The proximate was determined infrared spectroscopy its lipidome liquid chromatography–mass spectrometry structural analysis. Data analyzed repeated measures using mixed-model procedures with effect. Results: An energy balance nadir occurred at 1 for but more severe (−4.5 vs. −14.8 Mcal net per day, respectively) cows. Lipidomic comparison most abundant triacylglycerols (TAGs) revealed had TAGs least two preformed fatty acids fewer de novo synthesized milk. Fatty acid analysis increase responsible different TAG profiles Furthermore, contained free carnitine, short-chain acylcarnitines lactic butyric 3-hydroxybutyric Conclusions: These results demonstrate differences primarily between genotypes

Язык: Английский

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