Milk fat content was changed by ruminal infusion of mixed VFAs solutions with different acetate/propionate ratios in lactating goats

Li, B.; Wang, Z.H.; Li, F.C.; Lin, Xueyan

doi:10.1016/j.smallrumres.2006.07.014

Cited by 8 publications

(7 citation statements)

References 33 publications

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“…Secondly, the concentrate consumption was not to the detriment of hay consumption since the highest level of concentrate supplementation (2.5 % of body weight) gave concentrate to hay intake ratio of 50:50. The fibre intake may have been enough as not to affect the rumen pH and VFA concentrations as evident in Table 7 , and ultimately not affecting acetic acid which ruminal molar ratio has been reported to be positively and significantly correlated with milk fat percent ( Li, Wang, Li, & Lin, 2007 ).…”

Section: Resultsmentioning

confidence: 99%

Influence of levels of supplementary concentrate mixture on lactation performance of Red Sokoto does and the pre-weaning growth rate of their kids

Otaru

Adamu

Ehoche

2020

Veterinary and Animal Science

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Highlights Concentrate mixture containing palm oil was fed at graded levels to lactating goats Total DMI increased with concentrate level and intake of hay was not compromised Higher concentrate levels improved daily milk yield by 48% with higher persistency of production Dam milk yield accounted for 61% variation in kids pre-weaning daily weight gain

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Section: Resultsmentioning

confidence: 99%

Influence of levels of supplementary concentrate mixture on lactation performance of Red Sokoto does and the pre-weaning growth rate of their kids

Otaru

Adamu

Ehoche

2020

Veterinary and Animal Science

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“…These inconsistencies imply that lactation stage interacts with the hyperinsulinemic treatment in terms of its effect on milk fat yields. Elevated circulating insulin is presumed to increase the uptake of lipogenic precursors (acetate and BHBA) and decrease the process of FA release in adipose tissues (Bauman and Griinari, 2001;Li et al, 2007). A reduction in lipogenic precursors limits the mammary gland's ability to synthesize short-and medium-chain FA, which are considered locally synthesized by the gland (Kinsella and McCarthy, 1968).…”

Section: Figurementioning

confidence: 99%

“…Plasma insulin concentration and the animal energy balance are major factors influencing milk fat concentration and composition (Griinari et al, 1997;de Vries and Veerkamp, 2000). The effect of insulin on milk fat has been studied in dairy cows and goats (Corl et al, 2006;Li et al, 2007). Nevertheless, the mechanisms underlying the changes in milk fat associated with plasma insulin concentration are still under debate.…”

Section: Introductionmentioning

confidence: 99%

Hyperinsulinemic clamp modulates milk fat globule lipid composition in goats

Argov-Argaman

Mbogori

Sabastian

et al. 2012

Journal of Dairy Science

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We determined the effect of insulin on milk fatty acid (FA) and lipid composition in goats. Four dairy goats, 150 d in milk, were subjected to hyperinsulinemic clamp (treatment) or saline (control) infusion for 4d in a crossover design study. Composition and concentration of plasma and milk FA, triglycerides, phospholipids, sphingolipids, and cholesterol were determined. Mammary gland biopsies were taken at the end of each experimental period and lipogenic gene expression was determined. Plasma insulin was elevated 3.5-fold, whereas plasma glucose remained constant during the treatment period. Feed intake decreased by 26% and fat yield decreased by 17% relative to controls. No change in nonesterified FA concentration was found between controls and treatment. Compared with controls, insulin decreased yield of long-chain saturated FA by 14%. Milk concentration of long-chain FA was reduced by 3%, whereas that of medium-chain FA increased by 5% during the treatment compared with controls. Hyperinsulinemic clamps increased the yields of milk phospholipids by 9% and cholesterol by 16%, whereas it only tended to decrease triglyceride yields (by 11%). Hyperinsulinemic treatment resulted in compositional changes in the milk fat globule membrane, as reflected by 15 and 9% decreases in phosphatidylethanolamine and phosphatidylcholine concentrations, respectively. Lipogenic gene expression of acyl coenzyme A carboxylase, stearoyl coenzyme A desaturase, and FA synthase did not change, whereas lipoprotein lipase gene expression tended toward an increase in the treatment period compared with controls. Hyperinsulinemic clamps reduce the availability of long-chain FA, which are considered to originate from the diet and adipose lipolysis for milk lipid synthesis by the mammary gland of goats. Under these conditions, long-chain FA might be preferentially channeled to phospholipid rather than triglyceride synthesis, hence increasing phospholipid yields. Mechanisms determining FA distribution among milk lipid components and the consequences of altered milk fat globule membrane lipid composition remained to be elucidated.

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“…In general, milk polar lipid composition and concentration are altered when systemic or local -within the mammary gland -changes in lipid metabolism are induced. Two factors with a known effect on whole-body lipid metabolism are insulin and progesterone (Bauman and Currie, 1980;Flint et al, 1984;Li et al, 2007). Although the concentrations of both hormones are frequently altered by glucogenic dietary supplementation in dairy cows and during the animal's estrous cycle, respectively, information about their individual and combined effects on lipid composition in milk is still scarce.…”

Section: Introductionmentioning

confidence: 99%

Influence of glucogenic dietary supplementation and reproductive state of dairy cows on the composition of lipids in milk

Mesilati-Stahy

Malka

Argov-Argaman

2015

Animal

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We studied the effects of the frequently used glucogenic dietary supplementation in dairy herds and the hormonal changes occurring during the normal estrous cycle on the composition and concentration of milk lipid components. Holstein dairy cows were synchronized with two injections of prostaglandin F2α (estrus = day 0). Animals were held as controls or drenched for 11 days (day −3 to day 8 of the cycle) with 850 ml/day liquid propylene glycol (treatment, n = 13 per group). Blood and milk samples were collected on day 1 and 8 of the cycle. In both groups, plasma progesterone concentration increased ∼10-fold between 1 and 8 days post-estrus. Milk fatty acid composition was associated primarily with estrous-cycle day: polyunsaturated fatty acids increased by 16%, n-6 by 15% and n-3 by 1% from day 1 to 8 post-estrus. Polar lipid composition was also altered by cycle day: phosphatidylethanolamine concentration was 2-fold and 1.5-fold higher on day 1 v. day 8 post-estrus in the control and treatment groups, respectively. Phosphatidylserine concentration in milk was also affected by cycle day by treatment interaction ( P = 0.04). A progesterone level by treatment interaction influenced the triglyceride-to-phospholipid ratio in the milk ( P = 0.02). The results suggest that progesterone plays a role in modulating milk lipid composition and structure. Therefore, strategies designed to alter milk lipid composition should consider the cow's reproductive status.

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Milk fat content was changed by ruminal infusion of mixed VFAs solutions with different acetate/propionate ratios in lactating goats

Cited by 8 publications

References 33 publications

Influence of levels of supplementary concentrate mixture on lactation performance of Red Sokoto does and the pre-weaning growth rate of their kids

Influence of levels of supplementary concentrate mixture on lactation performance of Red Sokoto does and the pre-weaning growth rate of their kids

Hyperinsulinemic clamp modulates milk fat globule lipid composition in goats

Influence of glucogenic dietary supplementation and reproductive state of dairy cows on the composition of lipids in milk

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