| dc.contributor.advisor | Professor Dr. Mst. Afroza Khatun | |
| dc.contributor.author | AKHTER, MST. SOAIBA | |
| dc.date.accessioned | 2022-04-25T06:08:32Z | |
| dc.date.available | 2022-04-25T06:08:32Z | |
| dc.date.issued | 2016-12 | |
| dc.identifier.uri | http://localhost:8080/xmlui/handle/123456789/862 | |
| dc.description | High levels of production and efficient feed conversion are the need of the
modern poultry industry, which to a certain extent could be achieved by the use
of specific feed additives. Antibiotic feed additives as growth promoters have
long been supplemented to poultry feed to stabilize the intestinal microbial flora,
improve the general performances and prevent some specific intestinal
pathology (Hassan et al., 2010). However, due to the emergence of microbial
resistance to antibiotics which are used to treat human and animal infections, the
European Commission (EC) decided to phase out, and ultimately ban the
marketing and use of antibiotics as growth promoters in feed. In other countries,
such as the USA, consumer pressure is pushing the poultry industry to rear
birds without antibiotics (Castanon, 2007). Antibiotics removal has led to poultry
performance problems, feed conversion increases and a rise in the incidence of
certain animal diseases, such as (subclinical) necrotic enteritis (Dibner &
Richards, 2005). Such a situation has compelled the researchers to explore the
utility of other non-therapeutic alternatives like organic acids, enzymes,
probiotics, prebiotics, herbs, essential oils and immunostimulants as feed
additives in poultry production. Commercial layer production in Bangladesh
has gained a momentum during 1980 and 1990 and it took the industrial shape
(Chowdhury, 2011). According to a source of Directorate of Livestock Service
(DLS), total poultry population in 2015-2016 was 3206.33 lakhs, but still there is a
deficiency of 483.16 crore numbers of eggs.The layer performance depends on
genetic background, nutrition, physiology, environment and management
(Banerjee, 1992). A laying hen produce eggs for a number of years, but profitable
rearing is obtained up to the age of 100-110 weeks | en_US |
| dc.description.abstract | A study was carried out to assess, examine and quantify the effect of dietary
exogenous phytase enzyme, Rena-Phytase-400 (RP) and organic acids mixture,
ProviMax (PRO) supplementation on production performance of laying hens at
the latter stage of production. Sixty Hisex Brown hens of 65 weeks old were
allocated to 5 treatments, each containing 12 hens. The hens in individual cages
were supplied feed 120 g/b/day (not fixed) containing 18.21% CP and 2762.21
MJ ME/kg diet. Laying hens were randomly alloted to 5 dietary treatments T0
(control), T1 (RP-2kg/tonne feed), T2 (PRO-1.5 kg/tonne of feed), T3 (RP1kg/tonne of feed + PRO-1kg/tonne of feed) and T4 (RP-1.5kg/tonne of feed +
*PRO-1.5kg/tonne of feed). Increased egg production was found in T1, T3 and T4
by about 8%, 6%, 8% in the first month, by 10%, 9% and 11% in the second
month and by 8%, 9% and 11% in the third month respectively than the control
diet(T0) in this study. Best results were found by the supplementation of
ProviMax @ 1.5 kg/Tonne of feed in T2 that increased hen day egg production
(%) by about 14%, 17.02% and 14.62% respectively in the successive months in
comparison with control group. It was found that phytase enzyme and organic
acids had no significant effect on body fatness but significant relationship within
treatment groups was found in the body composition parameters which includes
heart, liver, spleen and oviduct weight. Shell weight, shell percent, shell
thickness, shape index, Albumen index, yolk index, and percent yolk did not
maintain any relationship with increasing levels of phytase and organic acids
(p>0.05). The highest economical efficiency was obtained in T2 compared with
the T0, T1, T3 and T4 by 4.93%, 2.52%, 4.9% and 8.46% respectively. Increased egg
production against different doses of exogenous phytase and organic acids
signifies that decreased egg production at older ages of hens might be to some
extent appeared to be related to Phosphorus unavailability. Therefore, it became
imperative to test the effect of exogenous phytase and organic acids on egg
production maintaining different single and combined dose levels in order to
confirm and assess the results of the current study. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR. | en_US |
| dc.subject | EXOGENOUS PHYTASE ENZYME | en_US |
| dc.subject | ORGANIC ACIDS ON PRODUCTION PERFORMANCE | en_US |
| dc.subject | Phytase Enzyme | en_US |
| dc.title | DIETARY EFFECT OF EXOGENOUS PHYTASE ENZYME AND ORGANIC ACIDS ON PRODUCTION PERFORMANCE OF LAYING HENS AT THE LATTER STAGE OF PRODUCTION | en_US |
| dc.type | Thesis | en_US |
