Effects of prolonged release recombinant porcine somatotropin and dietary protein on the growth, feed efficiency, carcass yield and meat quality of pigs

Abstract

. 1994. Effects of prolonged release recombinant porcine somatotropin and dietary protein on the growth, feed efficiency, carcass yield and meat quality of pigs.Can. J. Anim. Sci. 74 [15][16][17][18][19][20][21][22]. The effects of prolonged release recombinant porcine somatotropin (rpST) and dietary protein were tested in 108 Lacombe pigs, allocated to control or rpST treatments at 70 kg and fed isoenergetic diets containing one of three protein levels (14, 17 or 20% CP). Recombinant derived porcine somatotropin was implanted in the ear weekly (Monsanto AgriculturalCo.,St.Louis,#CP115409, l2mgwkr.l.Thecontrol animalsweregivenaweeklyshaminjectionforaminimum of 4 wk. The prolonged release rpST had no effect on average daily gain (ADG, P>0.05), but did reduce both the feed:gain ratio (F:G, P<0.07) and dressing percentage (7 g kg-' reduction, P < 0.05). Although both the fat thickness (10th rib) and kidney fat were reduced 5.6 and 13.9%, respectively, the absolute organ weights for kidneys, liver, lungs and gastrointestinal tract increased between 5 and l0% in prolonged release rpST treated pigs compared with control pigs (P < 0.05). Bone also increased by 6 g kg ' 1f < O.OSI in prolonged release rpST treated pigs, but carcass muscle or fat proportions were not different. Prolonged release rpST caused a higher ultimate muscle pH, moisture content and shear value (P < 0.06) and lower drip loss and expressable juice (P < 0.05) compared with meat from control carcasses. Increasing the dietary protein had no effect on ADG, but did improve the F:G ratio (P < 0.05). Carcass Les animaux t6moins recevaient de leur cdt6 une injection placebo hebdomadaire pour au moins quatre semaines. L'administration de rpST par diffusion prolong6e n'avait pas d'effet sur le GMQ (P > 0,05), mais augmentait I'indice de consommation (P < 0,07) ei le rendement ir l'abattage (de 7 g kg ', P < 0,05;. Bien que 1'6paisseur du lard dorsal au niveau de la 10' cote et 1'accumulation de la graisse autour des reins 6taient diminu6s, respectivement de 5.6 etde 13,9%, le poids absolu des organes: reins, foie, poumons et tractus gastrointestinal, enregistrait des augmentations de 5 d10% chez les porcs trait6s ir la rpST (P < 0,05). La masse osseuse augmentait 6galement de 6 g kg ' 1P < 0.05t mais les proportions de maigre ou de gras dans la carcasse demeuraient inchang6es. La diffusion prolong6e de rpST produisait un accroissement des valeurs finales du pH. de RESULTS Growth and Feed EfficiencYPorcine somatotropin had no effect on growth performance of the pigs in this study (Table 2). Initial and final weights and days on test were similar (P > 0.05) for rpST and control pigs. Only the feed:gain ratio was reduced by rpST at P : 0.07 . The only significant interaction found was for protein x gender for initial weight on test. These results indicated that barrows and gilts had a similar response to rpST.Diet had no significant effect on average daily gain, daily feed intake or feed:gain ratio ( a.bDifferent lerrers are significant ar P < 0.05. Carca...

The water‐holding capacity of fresh meat

“…This may result in a higher drip loss. Somatropin is mainly used in pigs and is reported to decrease the amount of drip loss (25). B-Adrenergic agonists seem to have a negative effect on the water-holding capacity of the meat.…”

Deletion of amino acid residues 33-46 in growth hormone alters the hydrophobicity of the molecule

“…Revealing of the fact that GH could be used as a tool for increasing farm animals productivity (increase in milk and meat production by the exogenous supply of GH) has made biotechnologist to pay great attention to this molecule (Jones et al, 1994;Mikel, 1993;Seve et al, 1993;Sillence, 2004;Thatcher, 2002). GH has now been successfully produced as a recombinant protein with proper folding and is being heavily used in the dairy industry.…”

Instability Studies of Porcine Somatotropin in Aqueous Solutions and the Possible Reagents for Its Stabilization

“…It has been known for many years that exogenous administration of porcine somatotropin (pST) stimulates protein synthesis and inhibits lipogenesis, and therefore, can effectively improve growth rate, feed efficiency, and carcass leanness in finishing pigs (Seve et al, 1993;Mikel et al, 1993;Chung et al, 1985;Evock et al, 1988;Verstegen et al, 1991;Jones et al, 1994). Administration of pST to growing pigs could reduce carcass fat content by over 50% and improve production efficiency by 15 to 35% (Etherton et al, 1993).…”