1492 Effects of acidity and silage type on lysine retention among two lipid-coated ruminally protected lysine products

Reiners, Jessica N; Brake, D. W.

doi:10.2527/jam2016-1492

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“…Additionally, scanning electron micrographs seemed to indicate that the surface structure of lipid-associated lysine mixed with alfalfa silage was degraded equally despite differences in silage pH; however, the surface structure of lipid-associated lysine mixed with corn silage appeared to be more disrupted when mixed with more acidic corn silage in comparison to less acidic corn silage. Indeed, these surface structure images appear to be in agreement with our previous observation ( Reiners and Brake, 2016 ) that greater acidity increased amounts of lysine lost from lipid-associated lysine mixed with corn silage but that acidity had little impact on amount of lysine lost from lipid-associated lysine mixed with alfalfa silage. Obviously, surface structure images are subjective measures, but these images appear to agree with the report of Ji et al (2016) , our previous observations ( Reiners and Brake, 2016 ) and the conclusions of Block and Jenkins (1994) .…”

Section: Resultssupporting

confidence: 91%

“…Indeed, these surface structure images appear to be in agreement with our previous observation ( Reiners and Brake, 2016 ) that greater acidity increased amounts of lysine lost from lipid-associated lysine mixed with corn silage but that acidity had little impact on amount of lysine lost from lipid-associated lysine mixed with alfalfa silage. Obviously, surface structure images are subjective measures, but these images appear to agree with the report of Ji et al (2016) , our previous observations ( Reiners and Brake, 2016 ) and the conclusions of Block and Jenkins (1994) . Regardless, images from this preliminary study clearly indicate that measures of lysine bioavailability are necessary to allow an improved understanding of amounts of metabolizable lysine provided from lipid-coated lysine after exposure to silage.…”

Section: Resultssupporting

confidence: 91%

“… Ji et al (2016) reported that increased exposure to a silage-based diet increased amount of lysine loss from lipid-coated lysine products. Further, we ( Reiners and Brake, 2016 ) previously reported that amounts of lysine lost from lipid-associated lysine affected by silage type, acidity, and manufacture; however, we are not aware of any effort to image lipid-associated lysine surface structure after mixing lipid-associated lysine with alfalfa or corn silage containing different amounts of acidity.…”

Section: Resultsmentioning

confidence: 99%

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Lysine bioavailability among 2 lipid-coated lysine products after exposure to silage1

Reiners

Held

Wright

et al. 2017

Translational Animal Science

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We conducted 2 experiments to determine lysine bioavailability from 2 lipid-coated lysine products. In an in vitro experiment we mixed each lipid-coated lysine product with either alfalfa- or corn-silage at different amounts of acidity. Scanning electron micrographs indicated that surface structure of each lipid-coated lysine particle was eroded after mixing with silage. Additionally, visual evaluation of scanning electron micrographs suggested that peripheral surface abrasion of lipid-coated lysine may be greater when lipid-coated lysine was mixed with alfalfa silage in comparison to corn silage. In a corresponding experiment, in vivo measures of lysine bioavailability to sheep from 2 lipid-coated lysine products and lysine-HCl were determined after mixing in corn silage. Plasma lysine concentrations increased linearly (P < 0.01) in response to abomasal lysine infusion indicating that our model was sensitive to increases in metabolizable lysine flow. Bioavailability of each lipid-coated lysine source and dietary lysine-HCl were calculated to be 23, 15, and 18%, respectively. Even though each dietary source of lysine increased plasma lysine, rates of increases in plasma lysine from one lipid-coated lysine source (linear; P = 0.20) and lysine-HCl (linear; P = 0.11) were not different from plasma lysine levels supported by diet alone. However, the rate of plasma lysine increase in response to lysine from the other lipid-coated lysine source was greater (P = 0.04) than plasma lysine from feed alone. Nonetheless, the rate of plasma lysine increase in response to lipid-coated lysine did not differ (P ≥ 0.70) from the rate of plasma lysine increase from lysine-HCl. Clearly, methods of manufacture, together with physical and chemical characteristics of diet, can impact amounts of metabolizable lysine provided from lipid-coated lysine products. Direct measures of lysine bioavailability from lipid-coated lysine products after mixing with diets should be based on measurements with the products treated similarly to the method of feeding.

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