Levels of digestible methionine+cystine in diets for high genetic potential barrows from 95 to 125 kg

Abstract

This study was carried out to evaluate the effects of increasing levels of digestible methionine+cystine on performance and carcass composition of high genetic potential barrows for lean deposition. Sixty-four barrows with initial weight of 95.46 ± 1.09 kg were allotted to a completely randomized block design, with four levels of digestible methionine+cystine (0.427, 0.466, 0.504, and 0.545%, corresponding to the digestible methionine+cystine:digestible lysine ratios of 57.0, 62.0, 67.0 and 73.0%, respectively), with eight replicates, and two animals per experimental unit. Experimental diets and water were provided ad libitum until the end of the experimental period when pigs reached 125.21 ± 2.49 kg. Levels of digestible methionine+cystine did not affect daily intake, daily weight gain and feed conversion of the animals, but they affected daily intake of digestible methionine+cystine which increased linearly. Levels of digestible methionine+cystine did not affect carcass weight, meat amount, backfat thickness at P2, and daily meat deposition. The digestible methionine+cystine level of 0.427%, corresponding to the digestible methionine+cystine:lysine ratio of 57.0% and to a daily digestible methionine+cystine intake of 14.20 g/d, provides the best performance and carcass traits for high genetic potential barrows in the phase of 95 to 125 kg.

Effectiveness and optimum level of protected methionine in fattening pig diets

“…On the contrary, a Met deficiency in pigs can lead to lower DWG (Conde-Aguilera et al, 2014), growth suppression of the intestinal mucosa, reduction of intestinal epithelium, and increase of oxidative stress (Bauchart-Thevret et al, 2009;Chen et al, 2014). Several studies have showed that pigs can tolerate some Met deficiency (Santos et al, 2011;Ying et al, 2015) or excess levels in the diet (Pena et al, 2008).…”

“…Methionine (Met) is the second or thirdlimiting aminoacid (AA) in conventional diets for growing pigs, which can lead to its deficiency, reduced availability for protein synthesis and limited growth (Bauchart-Thevret et al, 2009;NRC, 2012;Chen et al, 2014). The Met levels present in most dietary ingredients for pigs are insufficient; thus, it must be provided from a synthetic source (Santos et al, 2011). Additionally, bioavailability and bioefficacy of synthetic DL-Met isomers show inconsistent results in growth performance of pigs (Shen et al, 2014;Kong et al, 2016).…”

“…(Opapeju et al, 2012;de Oliveira et al, 2015). Although pigs can tolerate some shortage or surplus of Met (Pena et al, 2008;Santos et al, 2011;Ying et al, 2015) its excess can affect growth performance and carcass characteristics, while low Met levels can increase fat deposition, reducing protein synthesis (Conde-Aguilera et al, 2014). Appropriate dietary concentration of Met depends on each analyzed variable (Zhang et al, 2013).…”

Demographic Diversity of Food Intake and Prevalence of Kidney Stone Diseases in Indian Continent

“…In addition potassium citrate is usually taken as a drug for reducing renal acidosis [99]. In food, animal proteins containing methionine like meat break down into cystines which increase urinary cystine level in the body [100]. In a study it was shown that urinary cysteine excretion reduced to 34% by consuming very low protein diet nearly 20g/day [101].…”

Multi-objective optimization of methionine+cysteine levels in diets for growing pigs

“…Cysteine (Cys) is included in the structure of many proteins, linking polypeptide chains as a precursor of taurine and glutathione (Baker, 1991). Most Cys must be obtained from dietary Met since many feed ingredients lack of adequate Cys levels (Santos et al, 2011). Thus, Met should be added into pig diets to meet the methionine+cysteine (Met+Cys) complex requirement.…”