45 Using the indicator amino acid oxidation technique to study threonine requirements in horses

Mok, Chan Hee; Brewster-Barnes, Tammy; Urschel, Kristine L.

doi:10.1016/j.jevs.2015.03.055

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“…For example, greater requirement estimates have been determined when using plasma urea N concentrations compared to the slaughter technique (Dourmad and Etienne, 2002) and the use of plasma AA concentrations has been demonstrated to be poorly correlated with other requirement estimate techniques (Levesque et al, 2011). The IAAO method has been suggested as the "gold standard" method for evaluating AA requirements (Mok, 2015). This is followed by the N balance method despite the fact that numerous studies report that N balance overestimates the requirements (Just et al, 1982;Quiniou et al, 1995;Lenis et al, 1999;De Lange et al, 2001).…”

Section: Empirical Estimates Of Aa Requirements For Gestating Sowsmentioning

confidence: 99%

Efficiency of standardized ileal digestible lysine utilization for whole body protein deposition in pregnant gilts and sows during early-, mid-, and late-gestation

Ramirez-Camba

Dunn²,

Htoo

et al. 2020

Journal of Animal Science

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The efficiency of SID Lys utilization (kSID Lys) in gilts and sows during early (d 48-52), mid (d 75-79) and late gestation (d 103-107) was investigated using 88 pregnant females (PIC 1050; 27 gilts, 27 parity 1 sows, 34 parity 2+ sows; 192.96 ± 22.84 kg at d 42 ±1 of gestation) and whole body nitrogen (N) retention balance studies. Females were assigned to one of 4 SID Lys levels ranging from 40 to 70% of the daily SID Lys requirements above maintenance for a parity 1 sow according to the NRC (2012) gestating sow model in each gestation period. Experimental diets were isocaloric (3,335 kcal ME/kg) and isoproteic (11.75 % CP) and dietary indispensable AA were set to meet or exceed 100% of AA:Lys ratios. The slope of the linear response to graded SID Lys intake was defined as kSID Lys. With the aim of increasing the accuracy of kSID Lys estimates, gilt data from the current study was combined with gilt data from a previous study conducted at the same facility using 4 SID Lys levels ranging from 60 to 90% of the daily SID Lys requirements above maintenance for gilts according to the NRC (2012) gestating sow model. Whole body Lys retention of the combined gilt data set was assessed with different broken-line and nonlinear models. The kSID Lys was 0.65, 0.38 and 0.52 for early, mid, and late gestation, respectively in gilts. A linear response to graded SID Lys intake was found in late gestation only in parity 1 and 2+ sows; kSID Lys was determined as 0.44 and 0.52 in late gestation for parity 1 and parity 2+ sows , respectively. There were no differences in kSID Lys in late gestation between parities. For the combined gilt data, the model of best performance (reduced error and greater goodness of fit) was the Hoerl model. Maximum kSID Lys (i.e. g SID Lys retention/g SID Lys intake) in gilts was 0.67, 0.54, and 0.53 in early, mid and late gestation predicted at 7.2, 9.1 and 13.5 g of SID Lys intake/d, respectively based on the Hoerl model. Maximum SID Lys retention in gilts was similarly predicted at 8.5, 10.5 and 20.9 g of SID Lys intake/d in early, mid and late gestation and resultant kSID Lys of 0.61, 0.51 and 0.44, respectively. The findings of this study demonstrate that kSID Lys varies by stage of gestation and SID Lys intake level and that, at least in gilts, a dynamic kSID adjusted for daily intake more adequately reflects biological response and hence allows more precise feeding of pregnant females.

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Section: Empirical Estimates Of Aa Requirements For Gestating Sowsmentioning

confidence: 99%

Efficiency of standardized ileal digestible lysine utilization for whole body protein deposition in pregnant gilts and sows during early-, mid-, and late-gestation

Ramirez-Camba

Dunn²,

Htoo

et al. 2020

Journal of Animal Science

View full text Add to dashboard Cite

show abstract

45 Using the indicator amino acid oxidation technique to study threonine requirements in horses

Cited by 1 publication

References 0 publications

Efficiency of standardized ileal digestible lysine utilization for whole body protein deposition in pregnant gilts and sows during early-, mid-, and late-gestation

Efficiency of standardized ileal digestible lysine utilization for whole body protein deposition in pregnant gilts and sows during early-, mid-, and late-gestation

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