Efficiency of utilization of food energy by growing pigs

Burlacu, G.; Iliescu, M.; Stavri, J.

doi:10.1017/s0021859600048711

Cited by 13 publications

(5 citation statements)

References 5 publications

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“…Estimates of bp ranged from 7.43 kcal/g (Burlacu et al, 1973) to 15.96 kcal/g (Kielanowski and Kotarbinska, 1970). The range for estimates of bF was 9.5 kcal/g (Burlacu et al, 1976) to 16.16 kcal/g (Sharma and Young, 1970). There was more variation between experiments for estimates of bp than for estimates of b F and Kielanowski (1965) has discussed possible explanations for this variability.…”

Section: Resultsmentioning

confidence: 99%

Index Selection and Feed Intake Restriction in Swine. II. Effect on Energy Utilization

Cleveland

Johnson

Mandigo

et al. 1983

Journal of Animal Science

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SummaryFifty-three index select and control line barrows were randomly assigned to three feeding levels at 83 d of age. They were slaughtered at approximately 188 d of age to determine the effects of index selection (for increased average daily gain and decreased backfat) and level of feed intake on energy utilization. During the trial, the feed intake levels were twice daily to appetite (AP), once daily feeding of 91% of appetite (AP91) or once daily feeding of 82% of appetite (AP82) intake. The metabolizable energy intake required per kilogram of edible lean deposited (Mcal/kg) was reduced (P<.05) by restricting intake and was lower (P<.01) for index than for control barrows [index: 25.6 (AP), 23.3 (AP91) and 25.3 (AP82) vs control: 31.1 (AP), 27.5 (AP91) and 28.1 (AP82)]. However, intake restriction and index selection increased (P<.05) the energy lost per unit of retained energy (index: 1.33, 1.45 and 1.53 vs control: 1.24, 1.29 and 1.34). The index line had a higher (P<.05) maintenance requirement than the control line when expressed'unit of weight (kg'TS) -1" day -I, but the difference was less when expressed'unit of lean (kg'S3)-l'day -I. The energy cost of protein deposition varied from 9.02 to 11.25 kcal/g, while the energy cost of fat deposition ranged from 12.73 to 12.86 kcal/g. Variation among animals in metabolizable energy intake was explained by variation in lean mass maintained and the quantity of prOtein and fat deposited.

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Section: Resultsmentioning

confidence: 99%

Index Selection and Feed Intake Restriction in Swine. II. Effect on Energy Utilization

Cleveland

Johnson

Mandigo

et al. 1983

Journal of Animal Science

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“…Holmes et al (1980) found energy diges tibil ity figures for ma ize/barley rations to be 82% -84% . One might expect a lowe r di gestibility for the present ration wh ich inc luded a higher proportion of barley (Burlacu et al , 1978 ;Mo r gan et al , 1975�) . Digestibility of nitrogen (77%) was close to values given by Holmes et al (1980) of 76% and 80% .…”

Section: 5mentioning

confidence: 91%

The energy and nitrogen metabolism and performance of pigs infected with Oesophagostomum dentatum

Stewart¹,

Holmes²,

Smith³

et al. 1983

Anim. Sci.

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The effect of Oesophagostomum dentatum on the performance of growing pigs over the live-weight range 20 to 80 kg was investigated. Fourteen individually-penned pigs in Experiment 1 and 16 group-penned but individually fed pigs in Experiment 2 were orally dosed once with 80 000 or 20 000 larvae respectively at about 18 kg live weight. Worm-free but otherwise similar pigs served as controls. Three energy and nitrogen balance studies were undertaken in two open-circuit calorimeters on four infected gilts and their paired worm-free counterparts on two levels of feeding at 7, 21 and 49 days after infection. Worm burdens averaging 4 255 and 4 722 in Experiments 1 and 2 respectively were recorded post mortem but performance and carcass measurements were not affected, neither were there any clinical symptoms. No significant differences between infected and worm-free pigs were recorded for either apparent digestibility of nitrogen and gross energy or for nitrogen retention. Possible reasons for the lack of measurable effects on pig performance are discussed.

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“…O consumo de EM diário médio no mesmo período foi de 8232 kcal/dia (3250 kcal EM/kg da dieta) para os machos castrados alimentados AV e 7673 kcal/dia para os que iniciaram a RA aos 60 kg de peso vivo, o que corresponde a 3,39 e 3,16 vezes a necessidade de mantença, respectivamente. Dependendo do nível de restrição imposto e da faixa de peso em que a restrição é aplicada, a retenção de energia pode ser reduzida, como foi observado por BURLACU et al (1978), com restrição de 20% do consumo à vontade em leitões em crescimento.…”

Section: Resultsunclassified

Efeito do peso do suíno em terminação ao início da restrição alimentar sobre o desempenho e a qualidade da carcaça

2001

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RESUMO -Foi desenvolvido um estudo para determinar em que peso vivo deve se iniciar a restrição alimentar (RA), visando à melhoria do desempenho e da qualidade da carcaça em suínos machos castrados e fêmeas em terminação, alimentados com ração farelada, no período de inverno. Foram comparados quatro tratamentos: T1 -alimentação à vontade (AV) até o abate; T2 -AV até os 90 kg PV e após restrição alimentar (RA) de 10%; T3 -AV até os 75 kg peso e após RA de 10%; T4 -AV até os 60 kg PV e após RA de 10%. O experimento iniciou-se com peso vivo inicial dos animais de 52,58 ± 2,34 kg PV e encerrou-se com o peso de 119,27 ± 1,99 kg PV, quando os animais foram abatidos. A restrição alimentar iniciada em qualquer idade reduziu o ganho de peso diário (GPD), mas não melhorou a conversão alimentar (CA) nem as características de carcaça dos machos castrados. Nas fêmeas, o GPD só foi reduzido naquelas que iniciaram a RA aos 60 kg peso, não havendo melhora da CA e nem da qualidade da carcaça com a RA iniciada em qualquer idade. Portanto, suínos com alto potencial para deposição de carne magra e baixo consumo voluntário de alimento, alimentados com dietas fareladas e contendo níveis adequados de aminoácidos, não respondem à restrição de energia com início entre os 60 e 90 kg PV para melhorar o desempenho e a qualidade da carcaça.Palavras-chave: carcaça, desempenho, fêmeas, machos castrados, manejo alimentar, rendimento de carne Effect of Live Weight at the Beginning of Feed Restriction on the Performance and Carcass Quality in Finishing PigsABSTRACT -This experiment was carried out to determine the best live weight to start the feed restriction (RA) in order to improve the performance and carcass quality of barrows and gilts at the finishing phase, fed with dry feed, in the winter period. Four treatments was compared: T1 -Full fed (AV) until the slaughter time, T2 -AV until 90 kg LW and after that 10% RA; T3 -AV until 75 kg LW and after that 10% RA; T4 -AV until 60 kg LW and after that 10% RA. The study started when animals had 52.58 ± 2.34 kg LW and finished with 119.27 ± 1.99 kg LW, when the animals were slaughtered. The feed restriction started at whatever age reduced the average daily gain (GPD), but feed: gain ratio (F/G) was not improved neither carcass traits of the barrows. In the gilts, RA reduced GPD only in that, which started RA at 60 kg LW and feed: gain was not improved neither carcass traits with RA started at whatever age. Therefore, swine with high potential to lean meat deposition and low feed intake, fed with dry diets, which contain suitable levels of amino acids, do not respond to energy restriction starting between 60 and 90 kg to improve performance and carcass quality.

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Efficiency of utilization of food energy by growing pigs

Cited by 13 publications

References 5 publications

Index Selection and Feed Intake Restriction in Swine. II. Effect on Energy Utilization

Index Selection and Feed Intake Restriction in Swine. II. Effect on Energy Utilization

The energy and nitrogen metabolism and performance of pigs infected with Oesophagostomum dentatum

Efeito do peso do suíno em terminação ao início da restrição alimentar sobre o desempenho e a qualidade da carcaça

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