Effect of incremental dietary addition of 2-hydroxy-4-(methylthio) butanoic acid isopropyl ester on milk production and composition of dairy cows

Phipps, R. H.; Jones, A. K.; Devillard, Estelle; Geraert, P. A.; Bennett, R.; Reynolds, Christopher K.

doi:10.1017/s2040470010003365

Cited by 3 publications

(1 citation statement)

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“…Addition of fat increased the ECM yield compared to CON; however, there was no significant difference, probably due to the low number of animals used. Adding HMBi to the diet resulted in the numerical highest ECM yield, both in the production trial and in the present study, as also observed by Phipps et al (2010) and Cermáková et al (2012). However, the effect of HMBi supplementation was only +0.7 kg ECM/d in the production trial (Alstrup et al, 2015) compared to +3.2 kg ECM/d in the present experiment.…”

Section: Feed Intake and Milk Productionsupporting

confidence: 82%

Effect of fat supplementation and stage of lactation on methane production in dairy cows

Alstrup

Hellwing

Lund

et al. 2015

Animal Feed Science and Technology

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Section: Feed Intake and Milk Productionsupporting

confidence: 82%

Effect of fat supplementation and stage of lactation on methane production in dairy cows

Alstrup

Hellwing

Lund

et al. 2015

Animal Feed Science and Technology

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Milk yield, feed efficiency and metabolic profiles in Jersey and Holstein cows assigned to different fat supplementation strategies

et al. 2015

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Effect of forage source and a supplementary methionine hydroxy analog on nitrogen balance in lactating dairy cows offered a low crude protein diet

Whelan

Mulligan

Flynn

et al. 2011

Journal of Dairy Science

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Four primiparous and 4 multiparous midlactation dairy cows were stratified by pre-experimental milk yield (23.5 ± 2.3 kg/d), protein yield (0.75 ± 0.066 kg/d), parity, and days in lactation (121 ± 10 d) into 4 groups of 2 in a 2 × 2 factorial, Latin square design (n = 8) to assess the effect of forage source and a supplementary methionine hydroxy analog on nitrogen (N) balance where low crude protein (CP) diets (13.3%) are offered. Diets contained either predominantly grass silage [GS (G- and G+)] or corn silage [CS (C- and C+)] as the forage source and were offered with (G+ and C+) or without (G- and C-) the isopropyl ester of 2-hydroxy-4 methylthio butanoic acid (HMBi). The G- and G+ contained 46% GS and 10% CS in the dry matter (DM), whereas C- and C+ contained 12% GS and 52% CS in the DM. Supplementary HMBi was included at a rate of 0.2% of DM in G+ and C+ diets. Diets were isonitrogenous (9.8 ± 0.4% protein truly digested in the small intestine) and isoenergetic (0.96 ± 0.01 units of energy for lactation; kg/DM). Each of the 4 experimental periods lasted 24 d: 14 d for dietary adaptation, followed by 10 d of housing in individual metabolism stalls; N balance was conducted on the last 5 d of each experimental period. Intake of DM was higher for CS-based vs. GS-based diets (20.23 vs. 18.41 kg/d). No effect of dietary treatment was found on milk yield or yields of milk fat, protein, and lactose. Supplementing with HMBi tended to improve milk solids yield (1.69 vs. 1.59 kg/d), casein yield (0.59 vs. 0.55 kg/d), and concentrations of casein (2.89 vs. 2.73%) and protein (3.58 vs. 3.49%) in the milk. Dietary N intake was higher for CS-based vs. GS-based diets (0.460 vs. 0.422 kg/d). However, forage source or supplementary HMBi had no effect on N excretion in the feces, urine, or milk. Excretion of urinary urea was positively related to N intake. Concentrations of urea N in the plasma (2.34 vs. 1.72 mmol/L), milk (2.54 vs. 2.24 mmol/L), and urine (123.32 vs. 88.79 mmol/L), and total excretion of urinary urea N (40.23 vs. 35.09 g/d) were higher for animals offered CS-based vs. GS-based diets. Corn silage improved N intake through improved DM intake. However, neither forage source nor HMBi supplementation affects N output in the feces, urine, or milk.

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Effect of incremental dietary addition of 2-hydroxy-4-(methylthio) butanoic acid isopropyl ester on milk production and composition of dairy cows

Cited by 3 publications

References 1 publication

Effect of fat supplementation and stage of lactation on methane production in dairy cows

Effect of fat supplementation and stage of lactation on methane production in dairy cows

Milk yield, feed efficiency and metabolic profiles in Jersey and Holstein cows assigned to different fat supplementation strategies

Effect of forage source and a supplementary methionine hydroxy analog on nitrogen balance in lactating dairy cows offered a low crude protein diet

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