Digestibilities of amino acids in soyabean, sunflower and groundnut meals, determined with intact and caecectomised cockerels

Abstract

1. Three isonitrogenous diets were formulated in which soyabean (dehulled), sunflower (hulled) and groundnut (dehulled) meals were the sole protein sources. 2. 50 g of each diet was tube-fed to each of 24 intact and 24 caecectomised cockerels, which had been previously starved for 48 h. Excreta were collected, individually, for 48 h. The concentrations of amino acids in the diets and excreta were determined, and digestibility coefficients calculated. 3. Differences between intact and caecectomised birds for true digestibility evaluations reached significance for threonine, glycine and lysine only. Deamination of threonine and glycine, and synthesis of lysine, in the caeca was implied. 4. Neither the true digestibility of nitrogen, nor that of the sum of the amino acids differed between protein sources. 5. True digestibilities of most essential amino acids, considered individually, in sunflower and groundnut meals were similar to or greater than, those of soyabean meal. Exceptionally, lysine was more digestible in soyabean (0.879) than in sunflower (0.722) or groundnut (0.788) meals.

Ileal digestibility of amino acids of pea protein concentrate and soya protein sources in broiler chicks

“…In the current trial most of the differences observed in CIAD of CP and AA among protein sources disappeared when the values were corrected for the basal endogenous losses. In contrast, Green et al (1987) have found that the CIAD of most AA was higher for sunflower meal than for SBM and that these differences were maintained when the CIAD was corrected for basal endogenous losses. The reasons for the discrepancies among authors might be explained by differences in the methodology used; Green et al (1987) used 3 kg BW caecectomized cockerels starved for 48 h and force-fed 50 g of diet whereas in the current experiment 21-day-old broilers fed ad libitum were used.…”

Nutritional evaluation of transgenic high‐methionine lupins (Lupinus angustifolius L) with broiler chickens

“…Firstly, it is known that methionine in sun¯ower seed protein is highly digestible compared with that from other plant seed proteins. 21,22 Secondly, the higher methionine content in the transgenic lupins may mean that the amount of endogenous methionine output would become smaller relative to the amount of true undigested methionine, resulting in increased apparent digestibility of methionine. The digestibility of amino acids in conventional lupins is similar to those reported by Ravindran et al 5 for broiler chickens.…”

The Practical Application of Sunflower Meal in Poultry Nutrition

“…Green et al (1987) pointed out that true digestibility of most essential amino acids in SFM were similar to or greater than those of SBM exceptionally lysine amino acid which was more digestible in SBM (87.9%) than in SFM (72.2%). In this connection, Dessouky (1996) reported that SFM is high in some amino acids such as aspartic, arginine and glutamic contents and low in others like lysine, tyrosine, methionine and cystine contents.…”

“…The nitrogen-corrected apparent metabolizable energy (AME n ) value of full fat sunflower seed was lower than 18.71 MJ/kg and 17.67 MJ/kg reported by Rodriguez et al (1998) and Rodriguez et al (2005), respectively. Green et al, (1987) stated that groundnut and sunflower meals were similar in true digestibility of most essential amino acids but lower than that of SBM. Generally, according to the NRC (1994) SFM contains 32% CP, 1.1% EE, 24% CF and 1543 ME per Kcal/Kg.…”