Effects of ractopamine, genotype, and growth phase on finishing performance and carcass value in swine: II. Estimation of lean growth rate and lean feed efficiency

Gu, Yan; Schinckel, A. P.; Forrest, J. C.; Kuei, C. H.; Watkins, L. E.

doi:10.2527/1991.6972694x

Cited by 38 publications

(10 citation statements)

References 9 publications

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“…Resultado similar foi observado por Gu et al (1991b) Médias seguidas de letras distintas na mesma linha são diferentes (P<0,05) pelo teste F.…”

Section: Resultsunclassified

“…Esses resultados justificam o uso desse aditivo durante 28 dias consecutivos. Essa melhora observada na PCM foi semelhante à encontrada por Gu et al (1991b) e maior que a descrita por Zagury (2002). O melhor resultado obtido nos animais tratados com RAC pode ser atribuído à melhora na conversão alimentar.…”

Section: Means Followed By Different Letters Within a Row Are Differeunclassified

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Efeito da ractopamina e de métodos de formulação de dietas sobre o desempenho e as características de carcaça de suínos machos castrados em terminação

Marinho¹,

Fontes²,

Silva

et al. 2007

R. Bras. Zootec.

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Effect of ractopamine and the methods of diet formulation on the performance and carcass characteristics of finishing barrowsABSTRACT -An experiment was conduced with the objective of evaluating the effects of diet formulation methods and supplementation of ractopamine (RAC) on the performance and carcass characteristics of finishing barrows. Sixty commercial hybrid swines were used, distributed in a randomized experimental block design, in a 2 x 3 factorial arrangment, with two levels of RAC and three methods of diet formulation. Supplementation with RAC improved the final weight, daily weight gain (DWG) and feed conversion (FC) of the finishing barrows. Addition of RAC improved also the carcass characteristics by reducing the backfat thickness in point P 1 and increase daily lean meat deposition rate. Diets formulated based in the concept of ideal protein or by the increase of soybean meal provided better results on FC, but did not influence significantly daily feed intake, DWG and carcass characteristics. Finishing barrows supplemented with RAC during 21 or 28 days showed better performance and carcass quality. Diets formulated to attend the levels of digestible lysine by the inclusion of L-lysine HCL with the adjustment of other amino acids for ideal protein relation (ideal protein) or by the greater inclusion of soybean meal (increase of CP)provided better results of feed conversion in finishing borrows supplemented with RAC during 28 days.

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“…Resultado similar foi observado por Gu et al (1991b) Médias seguidas de letras distintas na mesma linha são diferentes (P<0,05) pelo teste F.…”

Section: Resultsunclassified

Section: Means Followed By Different Letters Within a Row Are Differeunclassified

Efeito da ractopamina e de métodos de formulação de dietas sobre o desempenho e as características de carcaça de suínos machos castrados em terminação

Marinho¹,

Fontes²,

Silva

et al. 2007

R. Bras. Zootec.

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“…It has been suggested that there is a muscle deposition peak of pigs near 60 to 90 kg body weight and thereafter fat deposition becomes the main part of the body weight gain (Gu et al, 1991; Wagner et al, 1999). In our study, growing-finishing pigs whose initial weight was approximately 75 kg were selected to investigate the effect of dietary Cr as CrMet.…”

Section: Discussionmentioning

confidence: 99%

Effects of Dietary Chromium Methionine on Growth Performance, Carcass Composition, Meat Colour and Expression of the Colour-related Gene Myoglobin of Growing-finishing Pigs

Zhu

Niu

et al. 2013

Asian Australas. J. Anim. Sci

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To investigate the effect of dietary chromium (Cr) as Cr methionine (CrMet) on growth performance, carcass traits, pork quality, meat colour and expression of meat colour-related genes in growing-finishing pigs, 189 crossbred Duroc×(Landrace×Yorkshire) growing-finishing pigs (male, castrated, average initial BW 74.58±1.52 kg) were selected and randomly allocated into four groups. Dietary treatments per kg of feed were as follows: 0 (CT), 0.3 mg/kg (T1), 0.6 mg/kg (T2) and 0.9 mg/kg (T3) Cr (in the form of CrMet; as-fed basis), and each treatment was replicated five times with 8 to 10 pigs per replicate pen. During the 28 d of the experiment, both the ADG and the ADFI increased linearly (p<0.05) as the level of dietary Cr increased. The F/G ratio decreased linearly (p<0.05). As dietary Cr increased, loin muscle areas (linear, p = 0.013) and average backfat thickness (linear, p = 0.072) decreased. Shear force (linear, p = 0.070) and Commission Internationale de I’Éclairage (CIE) redness (quadratic, p = 0.028) were increased. In addition, CIE Lightness (quadratic, p = 0.053) were decreased as dietary Cr increased. As dietary Cr increased, total myglobin (Mb) content (quadratic, p = 0.015) and the mb mRNA levels (quadratic, p = 0.046) in longissimus muscles of pigs were up-regulated. In conclusion, supplementation of dietary Cr improved growth and meat colour, but increased shear force and decreased IMF reduced palatability of longissimus muscles. Moreover, the increasing total Mb content and mb mRNA levels indicated that CrMet dietary supplementation may improve meat colour via up-regulating expression of the mb gene.

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“…However, since that time, multiphase early-weaning programs have been introduced that employ diets rich in simple, highly digestible carbohydrates and proteins that are quite different from the wheat-soybean meal or meat-and-bone meal diets used in the earlier investigations. Additionally, modern genotypes have greater potential for lean growth (Gu et al, 1991;Yen et al, 1991;Cameron et al, 1999) and reduced voluntary feed intake during the growing-finishing phase (Ewan, 1986).…”

mentioning

confidence: 99%

Effect of starter feeding program on growth performance and gains of body components from weaning to market weight in swine.

Whang

McKeith

Kim

et al. 2000

Journal of Animal Science

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Three experiments were conducted to test the hypothesis that different starter feeding programs (High, high quality; Low, low quality) will affect growth performance and body composition of pigs from weaning to market weight and that this effect may be influenced by gender (barrows or gilts) and breed (F, Yorkshire-Duroc x Hampshire; P, PIC Camborough 15 x PIC line 405). In Exp. 1, 21 +/- 4-d-weaned F pigs (n = 90) were used in a 2 (High or Low) x 2 (barrows or gilts) factorial design. In Exp. 2, 21 +/- 3-d-weaned pigs (n = 184) were used in a 2 (F or P) x 2 (High or Low) x 2 (barrows or gilts) factorial design. In Exp. 3, 21 F pigs from each gender and feeding program treatment were killed at d 0, 3, 7, 14, 42, 82, or 152 postweaning for evaluating body composition. Two starter feeding programs (High or Low) were applied to pigs for 6 wk postweaning. Pigs from both High and Low treatments were provided the same corn-soybean meal-based diets for the growing and finishing periods. Although the ADG of all pigs receiving the High treatment during the early starter period were higher (P < .01) than those of the Low, the terminal BW of F barrows were similar between High and Low (Exp. 1 and 2) and those of gilts were similar between High and Low (Exp. 2) (P > .80). However, the BW of P pigs receiving the High treatment, regardless of gender, tended to be heavier than those receiving the Low (Exp. 2) and F barrows receiving the High treatment tended to be heavier than those receiving the Low (Exp. 1). For the first 7 d postweaning, the High-fed pigs gained more protein (P < .05) and lost less fat (P < .05) than Low-fed pigs. During the growing-finishing period, the Low-fed pigs exhibited compensatory protein gain and achieved a body protein content similar (P < .60) to High-fed pigs by termination. Protein gains from weaning to termination between High- and Low-fed pigs were not different in Exp. 2 and 3. The protein gain of gilts was higher (P < .05) than that of barrows. Similarly, fat gain within genders was not affected by starter feeding program. Fat gain of gilts, however, was lower (P < .08) than that of barrows in Exp. 3. In conclusion, the nutritional quality of the starter feeding program affected growth performance immediately after weaning but did not affect protein gain over the entire production period.

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Effects of ractopamine, genotype, and growth phase on finishing performance and carcass value in swine: II. Estimation of lean growth rate and lean feed efficiency

Cited by 38 publications

References 9 publications

Efeito da ractopamina e de métodos de formulação de dietas sobre o desempenho e as características de carcaça de suínos machos castrados em terminação

Efeito da ractopamina e de métodos de formulação de dietas sobre o desempenho e as características de carcaça de suínos machos castrados em terminação

Effects of Dietary Chromium Methionine on Growth Performance, Carcass Composition, Meat Colour and Expression of the Colour-related Gene Myoglobin of Growing-finishing Pigs

Effect of starter feeding program on growth performance and gains of body components from weaning to market weight in swine.

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