JOURNAL OF ANIMAL SCIENCE AND VETERINARY MEDICINE
Integrity Research Journals
ISSN: 2536-7099
Model: Open Access/Peer Reviewed
DOI: 10.31248/JASVM
Start Year: 2016
Email: jasvm@integrityresjournals.org
Haematological profile, Henday production and effects of THI on Isa brown layers fed shrimp waste meal based rations
https://doi.org/10.31248/JASVM2026.657 | Article Number: 7CF8CFB87 | Vol.11 (3) - June 2026
Received Date: 14 April 2026 | Accepted Date: 25 May 2026 | Published Date: 30 June 2026
Authors: Victoria U. James* , Akaneren, I. Essien and Ofoninyene O. Usoro
Keywords: Haematological parameters, layers, Shrimp waste meal, temperature/relative humidity index, Henday production.
This study evaluated the replacement of fish meal with shrimp waste meal (SWM) as an animal protein source in the diets of laying hens and examined the effects of temperature and relative humidity on egg production. Ninety Point-of-Lay (POL) Isa Brown pullets were randomly assigned to five dietary treatments in a completely randomised design. Each treatment consisted of 18 birds, replicated three times with six birds per replicate. The 12-week experiment was conducted at the Akwa Ibom State University Teaching and Research Farm, Obio Akpa Campus, from November 2023 to March 2024. Five diets were formulated with fish meal replaced by SWM at 0, 25, 50, 75, and 100% levels. Treatment 1 (T1) contained 0% shrimp waste meal and 8% fish meal, T2 contained 2% SWM and 6% fish meal, T3 contained 4% SWM and 4% fish meal, T4 contained 6% SWM and 2% fish meal, and T5 contained 8% SWM and 0% fish meal. Haematological parameters were evaluated to determine the suitability of SWM as a fish meal substitute. Results showed that birds fed T5 (100% replacement) recorded significantly (p<0.05) higher values of white blood cells (WBC), red blood cells (RBC), haemoglobin (HGB), haematocrit (HCT), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH), and mean corpuscular haemoglobin concentration (MCHC) than birds on other treatments. Significant (p<0.05) differences were observed among treatments for most haematological parameters, except neutrophils, eosinophils, and lymphocytes. All values obtained were within normal ranges reported for laying hens. Regression and correlation analyses of Temperature Humidity Index (THI) and hen-day production (HDP) over the 12-week period revealed a weak positive correlation with morning THI values and a weak negative correlation with afternoon THI values, likely due to the mild to moderate THI conditions recorded during the study. Hen-day production generally declined with increasing duration of lay across treatments, except at the 50% SWM inclusion level, which showed a positive correlation with HDP. The study concluded that shrimp waste meal can effectively replace fish meal up to 100% in layer diets without adverse effects on haematological characteristics and may support blood production and overall bird health.
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