Digestibilidade aparente da dieta e balanço do nitrogênio em suínos de diferentes grupos genéticos com ou sem restrição alimentar

Sartor, Claudio; Hauschild, Luciano; Carvalho, A. D.; Garcia, Gerson Guarez; Kunrath, Marco Antônio; Lovatto, Paulo Alberto

doi:10.1590/s0103-84782006000200040

Cited by 3 publications

(2 citation statements)

References 18 publications

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“…Average BW, ADG and DFI values obtained in this trial were slightly lower than those obtained for this line in previous trials on the same experimental farm [19,20,25,30,31]. In general, the results of this study seem to indicate that selection for the growth rate during the growing period has not been effective in this line.…”

Section: Discussioncontrasting

confidence: 83%

A Trial Comparing Growing Rabbits Differing in 18 Generations of Selection for Growth Rate Reveals a Potential Lack of Effectiveness in the Genetic Selection Progress

Marín-García,

Martínez-Paredes,

Ródenas

et al. 2023

Animals

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A total of 338 weaned rabbits (from the R line, selected for post-weaning growth rate) were used to evaluate the response to 18 generations of selection for increased growth rate on rabbit performance. Animals were obtained from two vitrified populations of the R line: R19V, belonging to the 18th generation (n = 165), and R37V, belonging to the 36th generation (n = 173), were allocated in individual and collective pens (178 and 160, respectively). A fattening trial was conducted from weaning (28 d of age until 63 d of age). During the trial, the body weight (BW), daily feed intake (DFI), average daily gain (ADG) and feed conversion ratio (FCR) were weekly monitored. Additionally, mortality and morbidity were daily registered. On days 49 to 53, an apparent faecal digestibility trial was also performed (12 animals per generation). Our results indicate that the generation of selection for growth rate did not affect mortality and morbidity. There were no differences in the diet digestibility according to the generation of selection. Regarding performance traits, R37V animals showed higher global BW (+6.7%; p = 0.0011) than R19V animals. R37V animals showed the same BW at weaning; however, R37V animals showed higher BW values in the last three weeks compared with R19V animals. Animals from the R37V generation also showed a higher DFI from 56 to 63 d of age (+12%; p = 0.0152) than R19V animals. However, there were no differences in global ADG and FCR between generations. These results indicate that the selection for growth rate in growing rabbits has slowed down, suggesting a lack of effectiveness in the genetic progress.

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Section: Discussioncontrasting

confidence: 83%

A Trial Comparing Growing Rabbits Differing in 18 Generations of Selection for Growth Rate Reveals a Potential Lack of Effectiveness in the Genetic Selection Progress

Marín-García,

Martínez-Paredes,

Ródenas

et al. 2023

Animals

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“…Silva and Silva (2015) reported that genetics, age, diet composition, and room temperature have a direct effect on animal metabolism. Sartor et al (2006) reported that studies with pig commercial crosses, besides presenting variable results, do not consider differences among commercial crosses. In addition, the aforementioned authors did not observe any effect of commercial crosses on apparent digestibility of DM and CP in commercial crosses of grower pigs (Agroceres, Dalland, and Embrapa), which agrees with our findings.…”

Section: Resultsmentioning

confidence: 99%

Efeitos de dietas com baixo e alto teor de proteína bruta suplementadas até o quarto aminoácido limitante para dois cruzamentos comerciais de leitões iniciantes

Souza,

Genova,

Azevedo

et al. 2024

Sem. Ci. Agr.

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Este estudo foi composto por dois experimentos conduzidos para avaliar os efeitos de dietas com baixo e alto teor de proteína bruta suplementadas até o quarto aminoácido limitante e dois cruzamentos comerciais sobre o desempenho zootécnico, concentração de ureia plasmática (CUP), viabilidade econômica, digestibilidade aparente de nutrientes, e balanço de nitrogênio em leitões iniciantes. No Exp. I, um total de 128 leitões (14,02 ± 1,96 kg de peso corporal inicial e 48 dias de idade) foram distribuídos baseado no peso corporal inicial em um delineamento de blocos casualizados com arranjo fatorial 2 × 2. Foram avaliados dois cruzamentos comerciais (DB e PIC) e duas dietas de proteína bruta (baixa proteína bruta, BPB, e alta proteína bruta, APB). Foram utilizados quatro tratamentos, oito repetições e quatro leitões por unidade experimental. Exp. II foi conduzido utilizando 24 leitões machos inteiros (20,00 ± 1,41 kg de peso corporal inicial) alojados em gaiolas metabólicas por 12 dias e distribuídos no mesmo desenho experimental do Expt. I (seis repetições). Os resultados do Exp. I sugerem que os leitões alimentados com APB apresentaram melhor desempenho zootécnico. Foi observado um aumento de 25,2% na CUP em leitões alimentados com APB. Houve aumento de 18,2% no índice de eficiência econômica quando os leitões foram alimentados com APB, e também foi observada redução no custo por kg de ganho de peso corporal. No Exp. II, os leitões alimentados com APB apresentaram maiores coeficientes de digestibilidade aparente dos nutrientes, proteína e energia digestíveis, consumo e absorção de N. Não houve efeito dos cruzamentos comerciais sobre as variáveis de desempenho e metabolismo. Conclui-se que as dietas APB, independente da genética, promoveram melhorias no desempenho e no índice de viabilidade econômica, mas aumentaram a CUP nos leitões. Além disso, as dietas APB influenciaram positivamente a digestibilidade aparente dos nutrientes e a ingestão e absorção de N.

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Genetic selection of maternal lines and digestive efficiency in rabbits: long term selection for litter size at weaning versus hyper selection for reproductive longevity.

Pascual¹,

Ródenas²,

Martínez³

et al. 2010

World rabbit sci.

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ABSTRACT:The objective of the present paper is to evaluate how long-term selection for litter size at weaning or short-term hyper selection for reproductive longevity, affect the digestive utilisation of growing and lactating rabbits. A digestibility trial was carried out during the 3 rd week of lactation with a total of 27 multiparous does: 14 females came from a line selected for litter size at weaning over 32 generations (V), and 13 from a recently constituted, long lived-productive line (LP). Another digestibility trial was performed during the growing period with a total of 48 growing rabbits (24 from each line). After a 7 d adaptation period, faeces were collected individually for 4 d (from 13 to 16 d of lactation or from 49 to 53 d of age, respectively). Daily feed intake and weight gain recorded during the experimental growing period were similar for both lines (137 g of dry matter (DM)/d and 48 g/d, respectively). Growing rabbits from the V-line showed greater values for the digestibility of the DM and OM (+1 percentage point; P<0.10) and signifi cantly higher values for the acid detergent fi bre (+3 percentage points; P=0.03) than animals from the LP line. No signifi cant differences for the apparent digestibility coeffi cients of crude protein, neutral detergent fi bre, crude fi bre and gross energy were observed between lines, these being on average 65.7, 23.0, 10.7 and 52.6%, respectively. Females from the LP line were initially heavier (+258 g of live weight; P=0.06), and presented a signifi cantly greater daily feed intake (+22 g DM/d; P=0.04) and milk yield (+37 g/d; P=0.01) during the pre-experimental and faeces collection phases (from 6 to 16 d of lactation). V-line lactating does displayed greater values for digestibility for all those nutrients evaluated (from +0.9 and +3.7 percentage points for the crude protein and acid detergent fi bre) compared to the LP line females, although these were only signifi cant for the DM, organic matter and gross energy (+2.3, +2.5, +2.1 percentage points; P<0.05). In conclusion, rabbits selected for litter size at weaning seem to have greater effi ciency for digestive utilisation than those hyper selected for reproductive longevity.

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Digestibilidade aparente da dieta e balanço do nitrogênio em suínos de diferentes grupos genéticos com ou sem restrição alimentar

Abstract: RESUMO Um experimento foi realizado com o objetivo de estudar a digestibilidade aparente da dieta e o balanço do nitrogênio em suínos de diferentes grupos genéticos com ou

Cited by 3 publications

References 18 publications

A Trial Comparing Growing Rabbits Differing in 18 Generations of Selection for Growth Rate Reveals a Potential Lack of Effectiveness in the Genetic Selection Progress

A Trial Comparing Growing Rabbits Differing in 18 Generations of Selection for Growth Rate Reveals a Potential Lack of Effectiveness in the Genetic Selection Progress

Efeitos de dietas com baixo e alto teor de proteína bruta suplementadas até o quarto aminoácido limitante para dois cruzamentos comerciais de leitões iniciantes

Genetic selection of maternal lines and digestive efficiency in rabbits: long term selection for litter size at weaning versus hyper selection for reproductive longevity.

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