Nutritive value of palm kernel meal in diets for growing rabbits

ABSTRACT Keywords: Palm kernel meal Energy value Nutrient digestibility Fattening performance Growing rabbits The aim of this work was to determine the nutritive value of palm kernel meal (PKM) in diets for growing rabbits. In Experiment 1, 20 New Zealand x Californian growing rabbits 50 d-old were used to determine energy, crude protein, fibre and fat digestibility of PKM. The nutritive value was estimated by the difference method using a basal diet and another diet made by substituting 200g/kg of basal diet with PKM. Energy, crude protein, ether extract and neutral detergent fibre of PKM digestibilities were, respectively, 0.549 (±0.056, SE), 0.541 (±0.069), 0.850 (±0.048) and 0.430 (±0.101), and the digestible energy concentration was 10.9MJ/kg (±1.03) DM. In Experiment 2, 412 rabbits were allocated at random to the two experimental diets to measure growing performance. Inclusion of 200 g PKM/kg in the diet did not affect feed or digestible energy intake but decreased slightly (by around 5%) average daily gain (P = 0.003) and feed efficiency (P < 0.001). Neither mortality nor Clostridium perfringens counts in soft faeces were affected by type of diet. Palm kernel meal can be considered a palatable source of fibre, protein and fat for rabbits and can substitute significant amounts of other fibrous ingredients in the diet without adverse effects on growth performance

Nutritive value of palm kernel meal in diets for growing rabbits

The aim of this work was to determine the nutritive value of palm kernel meal (PKM) in diets for growing rabbits. In Experiment 1, 20 New Zealand × Californian growing rabbits 50 d-old were used to determine energy, crude protein, fibre and fat digestibility of PKM. The nutritive value was estimated by the difference method using a basal diet and another diet made by substituting 200 g/kg of basal diet with PKM. Energy, crude protein, ether extract and neutral detergent fibre of PKM digestibilities were, respectively, 0.549 (±0.056, SE), 0.541 (±0.069), 0.850 (±0.048) and 0.430 (±0.101), and the digestible energy concentration was 10.9 MJ/kg (±1.03) DM. In Experiment 2, 412 rabbits were allocated at random to the two experimental diets to measure growing performance. Inclusion of 200 g PKM/kg in the diet did not affect feed or digestible energy intake but decreased slightly (by around 5%) average daily gain (P = 0.003) and feed efficiency (P < 0.001). Neither mortality nor Clostridium perfringens counts in soft faeces were affected by type of diet. Palm kernel meal can be considered a palatable source of fibre, protein and fat for rabbits and can substitute significant amounts of other fibrous ingredients in the diet without adverse effects on growth performance

Variabilidad del valor nutritivo in vitro para porcino de los subproductos del secado del alperujo

Durante el proceso de secado del alperujo se obtiene una fracción de polvo que queda retenida en los ciclones de extracción de los gases húmedos, conocida como orujo ciclón (OC). Los OC suponen aproximadamente un 3% en peso del orujo graso (OG) producido (Clara González, comunicación personal). Actualmente los OC se reciclan en los OG, pero trabajos previos (Marcos et al., 2019) sugieren que, para rumiantes, los OC tienen un valor nutritivo potencialmente mayor a los OG por su mayor fermentación ruminal. La incorporación de OG a niveles del 20% en piensos de cebo para porcino permite reemplazar cereales sin afectar los rendimientos productivos, y reducir las emisiones de gases contaminantes del purín (Ferrer et al., 2017 y 2020). Sin embargo, la composición de los OG es muy variable (de Blas et al., 2015) lo que puede limitar sus niveles máximos de inclusión en la formulación de piensos. El objetivo de este trabajo es comparar la variación de la digestibilidad in vitro de la energía del OC y OG para su valorización nutricional en las matrices de formulación de piensos para porcino