Dr. Saeid Jafari completed his PhD studying the effects of papaya leaf and its extracts on methane production and fatty acid transformation in goats. His research found papaya leaf reduced methane emissions by 37% and improved the health profile of fatty acids. For his postdoctoral research, he is investigating antimicrobial resistance of Campylobacter in animals and humans in Southeast Asia, where data is scarce but resistance appears to be increasing. His published work aims to address this emerging public health crisis in the region.
My experiences and challenges during PhD study (jan 17, 2019)
1. My experiences and challenges as
PhD student in biological sciences
Presenter
Dr. Saeid Jafari
Seminar in Applied Animal
Sciences
(January 17, 2019)
29. In vivo study:
n=4 Three treatment
groups:
Control (50% concentrate +
50% alfalfa hay)
MPL (25 % of AH in basal
diet replaced by papaya leaf)
HPL (50 % of AH in basal
diet replaced by papaya leaf)
35. Figure 2. Effect of papaya leaf extracts
on in vitro CH4 production
-30%
36. a
b b
b
0.00
50.00
100.00
C 18:1n-9 C 18:2n-6 C 18:3n-3 C 18 PUFA
Biohydrogenation%
Fatty acids
CON
LPL
MPL
HPL
-50%
Figure 3. Effect of papaya leaf on
in vitro BH of fatty acids
37. a
c
b
ab
b
b
0
45
90
CON Hexane Chloroform Ethyl
acetate
Butanol Water
Biohydrogenation(%)
Treatments
Figure 4. Effect of papaya leaf extract on
in vitro BH of fatty acid
-30%
38. a
a a
b
a
a
c
b
b
30
60
90
0 2 4 6 8
Biohydrogenation(%)
Time of measurement (h)
CON
MPL
HPL
Figure 5. Effect of papaya leaf on
in vivo BH of fatty acid
-48%