Conventional protein ingredients are expensive, thus necessitating the use of
alternative sources of the nutrient. Feather Meal (FM) is high in Crude Protein (CP)
but poorly digested by monogastric animals due to the presence of keratin. Poultry
requires exogenous enzymes to break it down to its constituent amino acids.
Information on digestibility of CP of FM in broilers is scanty. Therefore, ileal CP
digestibility of FM supplemented with protease in broiler chickens was investigated.
Broiler feathers were hydrolysed to obtain FM using standard procedures. The
feathers and FM were analysed for their respective chemical compositions. One
hundred and forty-four 2-week old broilers weighing 223.0±11.1g were randomly
allotted to four diets containing 0, 2, 4 and 6% FM and TiO2 at 5 g/kg diet as marker
for two weeks. Body Weight Gain (BWG, g/bird), Feed Intake (FI, g/bird) and Feed
Conversion Ratio (FCR) were assessed. Digesta was collected from all birds to
determine Apparent CP Digestibility (ACPD). Another 336 twenty-one-day old
broilers were randomly assigned to eight diets containing 0, 2, 4 and 6% FM with 0 or
5 g protease/kg diet and TiO2 in a 2x4 factorial arrangement. At day 28, digesta was
collected from all birds for Digestible CP (DCP) determination in FM using standard
procedures. In a growth study, 360 1-day old broilers were randomly allotted to
twelve diets containing 0 or 2% FM at three CP levels (15.5, 17.5 and 23%) based on
recommended matrix value of protease and two protease levels (0 and 5 g/kg). They
were fed for 42 days in a 2x2x3 factorial arrangement. The BWG, FI, FCR, carcass
measures and organ weights were determined. Data were analysed using descriptive
statistics and ANOVA at α0.05.
Percentage chemical composition were 88.6 CP, 5.0 ether extract, 0.3 ash, 0.03
calcium, 0.04 phosphorus and 4.4 Kcal/g Gross Energy (GE) for the broiler feathers
and 83.8 CP, 10.3 ether extract, 0.6 ash, 0.02 calcium, 0.03 phosphorus and 4.3 Kcal/g
GE for FM. The ACPD (%) were 42.0±2.1, 52.0±1.9, 58.0±2.4 and 63.0±2.8; FI
obtained were 358.3±9.8, 323.6±15.6, 283.9±13.1 and 307.8±1.2; BWG were
218.9±24.9, 194.6±19.0, 145.7±15.6 and 152.8±16.8 and FCR were 1.6±0.3, 1.7±0.2,
2.0±0.3 and 2.0±0.2. With protease supplementation, ACPD (%) were 58.8±2.0,
64.1±2.0, 75.8±1.5 and 85.3±2.3 for birds on diets 0, 2, 4 and 6% FM respectively.
The DCP in FM was 65.9%±1.4 and 76.1%±2.3 without and with protease
respectively. The functional relationship between DCP and CP intake from FM
without protease supplementation was highly significant (R2=0.98). The FM inclusion
significantly decreased FI from 63.4±2.1 to 55.2±0.7 and BWG from 243.7±7.5 to
197.3±6.6 but increased FCR from 2.7±0.1 to 2.9±0.1 at 0-21days. At 22-42 days FI
decreased from 1647.5±25.3 to 1302.9±23.2, BWG from 605.4±15.0 to 579.1±18.7
and FCR from 2.8±0.0 to 2.3±1.0. Protease supplementation improved live weight,
percent dressed weight and significantly increased the breast meat by 2.1, 1.9 and
4.1% at 42 days.
Feather meal inclusion levels above 2% and its ileal digestibility required protease
supplementation for improved broiler performance.
Keywords: Hydrolysed feather meal, Ileal digestibility, Protease supplementation,
Broiler chicken performance
AJAYI, H (2021). Ileal Crude Protein Digestibility Of Feather Meal Supplemented With Protease In Broiler Chicks. Afribary. Retrieved from https://afribary.com/works/ileal-crude-protein-digestibility-of-feather-meal-supplemented-with-protease-in-broiler-chicks-1
AJAYI, Helen "Ileal Crude Protein Digestibility Of Feather Meal Supplemented With Protease In Broiler Chicks" Afribary. Afribary, 11 Apr. 2021, https://afribary.com/works/ileal-crude-protein-digestibility-of-feather-meal-supplemented-with-protease-in-broiler-chicks-1. Accessed 23 Mar. 2023.
AJAYI, Helen . "Ileal Crude Protein Digestibility Of Feather Meal Supplemented With Protease In Broiler Chicks". Afribary, Afribary, 11 Apr. 2021. Web. 23 Mar. 2023. < https://afribary.com/works/ileal-crude-protein-digestibility-of-feather-meal-supplemented-with-protease-in-broiler-chicks-1 >.
AJAYI, Helen . "Ileal Crude Protein Digestibility Of Feather Meal Supplemented With Protease In Broiler Chicks" Afribary (2021). Accessed March 23, 2023. https://afribary.com/works/ileal-crude-protein-digestibility-of-feather-meal-supplemented-with-protease-in-broiler-chicks-1