AMA, Agricultural Mechanization in Asia, Africa and Latin America
AMA, Agricultural Mechanization in Asia, Africa and Latin America (AMA) (issn: 00845841) is a peer reviewed journal first published online after indexing scopus in 1982. AMA is published by Farm Machinery Industrial Research Corp and Shin-Norinsha Co. AMA publishes every subjects of general engineering and agricultural engineering.
WOS Indexed (2026)
30 Jun 2026 (Vol - 57 , Issue- 07 )
31 Jul 2026 (Vol - 57 , Issue 07 )
Aim and Scope :
AMA, Agricultural Mechanization in Asia, Africa and Latin America
AMA, Agricultural Mechanization in Asia, Africa and Latin America (ISSN: 00845841) is a peer-reviewed journal. The journal covers Agricultural and Biological Sciences and all sort of engineering topic. the journal's scopes are in the following fields but not limited to:
Agricultural and Biological Sciences
Electrical Engineering and Telecommunication
Electronic Engineering
Computer Science & Engineering
Civil and architectural engineering
Mechanical and Materials Engineering
Transportation Engineering
Industrial Engineering
Industrial and Commercial Design
Information Engineering
Chemical Engineering
Food Engineering
Effect of Protein and Energy on semen production & its quality profiles and preservability in caprine species of Bay Islands
The present study was designed to evaluate the effect of dietary protein and energy supplementation on the reproductive physiology, semen production, semen quality and fertility of goat bucks under the humid tropical island ecosystem of the Andaman and Nicobar Islands. A total of twenty-four healthy bucks was randomly divided into four dietary groups: control (ICAR standard ration), 20% more protein (MP), 20% more energy (ME) and a combined supplementation of 20% more protein and energy (MPE). The experiment was conducted under the semi-intensive management system across the rainy and dry summer seasons. The scrotal and testicular biometrics, endocrine profiles, antioxidant status, sexual behaviour, semen production, semen quality parameters and fertility rate were evaluated. The result revealed that the bucks treated with combined supplementation (20% MPE) had shown significantly (p < 0.05) higher body weight, scrotal circumference, testicular volume and testicular weight as compared with the other groups. Endocrine profiles revealed that higher concentrations of FSH, LH, testosterone, TSH, T3 and T4 along with lower cortisol and prolactin levels were observed in the MPE group. Antioxidant markers such as TAC, SOD, CAT and GSH were significantly enhanced whereas malondialdehyde (MDA) levels and oxidative stress index were significantly reduced. The sexual behaviour scores such as libido and mating ability were also significantly improved. Semen characteristics such as volume, sperm concentration, motility, viability, acrosomal integrity, plasma membrane integrity and nuclear integrity were higher in the MPE group whereas the sperm abnormalities and lipid peroxidation were lower. The rainy season was more favourable for the reproductive performance as compared to the stressful dry summer season. The in-vivo fertility trials revealed that higher kidding rates and greater numbers of kids were observed in animals inseminated with semen from MPE-treated bucks under both farm and field conditions. The results revealed that dietary supplementation with 20% additional protein and energy effectively mitigated the seasonal stress, improved the endocrine balance and antioxidant defence and enhanced the semen quality and fertility rate in goat bucks under humid tropical island conditions. This nutritional strategy was served as a practical approach to improve the reproductive efficiency and semen preservation in caprine species of tropical humid island ecosystems.
Impact of scientifically designed housing on heat stress mitigation and performances of dairy cattle in humid tropical islands
Temperature humidity index (THI) triggers significant challenges to the livestock species on productivity, physiology and health. Housing design plays important roles in mitigation of these challenges. This 12-month comparative study was conducted at ICAR-CIARI, Sri Vijaya Puram, Andaman and Nicobar Islands, India with use of 48 crossbred dairy cattle equally divided between the two housing systems: a modern shed and a traditional shed. Macro- and micro-environmental THI, physiological profiles, hematological parameters, biochemical profiles, hormone profiles, oxidative stress markers, reproductive traits and milk quality profiles were estimated. The cattle housed in modern shed had exhibited significantly (P < 0.05) higher productive and reproduction performances. A higher (18.5%) average daily milk yield in cows (5.23 vs. 3.91 kg/day), higher growth rates in the calves (463.15 vs. 389.95 g/month) and earlier onset of reproductive maturity in the heifers (473.60 vs. 527.80 days to first heat) were reported in new shed housed cattle. Similarly, physiological profiles and biochemical parameters revealed higher blood values (hemoglobin: 11.08 vs. 9.53 g/dL), reduced oxidative stress (Thiobarbituric Acid Reactive Substances; TBARS: 1.74 vs. 2.33 nmol/mL) and lower cortisol (20.94 vs. 25.54 ng/mL) were reported in animals housed in new shed. The micro-climatic THI was significantly (p<0.05) lower in new shed (77.93 vs. 80.63) as compared to old shed; thus modern shed had enhanced thermal comfort in it. This study concluded that scientifically designed housing systems significantly improved the productivity, reproductive performance, health and welfare in cattle under humid tropical island ecosystem.
Stock Assessment and Population Dynamics of Common Carp (Cyprinus carpio Linnaeus, 1758) from Ottu Reservoir, Haryana, India
The present study assessed the population parameters and stock status of common carp (Cyprinus carpio) from the Ottu reservoir, Haryana, India using length-frequency data of 716 fish samples analysed through the FISAT-II software package. The asymptotic length (L∞) and growth coefficient (K) were 369.43 mm and 0.72 year-1, respectively with a growth performance index (φ′) of 4.99 indicating moderate growth. Natural mortality (M), fishing mortality (F), and total mortality (Z) rates were 1.1 year⁻¹, 1.73 year⁻¹ and 1.84 year⁻¹ respectively. Recruitment pattern indicates a single annual recruitment with a major peak during August-September. It was observed that the likelihood of capture at L25, L50, and L75 was 271.26, 296.15 and 307.71 mm, respectively with length at first capture (Lc) estimated at 296.15 mm. The relative yield per recruit (Y΄/R) and biomass per recruit (B΄/R) were 0.80 and 1.01, respectively. The exploitation (E) rate was estimated at 0.63, which indicated the fish was overexploited (E> 0.50) in the Ottu reservoir. These results indicate that in order to effectively utilization of C. carpio in Ottu reservoir, suitable fisheries management methods like limiting fishing effort and mesh size regulation are required.
Comparative Feeding Biology of the Minor Carp Labeo gonius (Hamilton, 1822) from the Burhi Gandak River and Birauli Oxbow Lake, India
The present study investigated the feeding biology of the minor carp Labeo gonius collected from two different freshwater ecosystem the Burhi Gandak River and Birauli Oxbow Lake in North Bihar, India. From August 2022 to July 2023, a total of 120 specimens were collected by monthly sampling to use gut content analysis, Relative Gut Length (RGL) and Gastro-somatic Index (GaSI) to assess dietary composition, feeding intensity and trophic characteristics. Sand and mud made up the majority of L. gonius diet (48.82% in Burhi Gandak River and 38.14% in Birauli Oxbow Lake), followed by diatoms (18.27% and 22.36%), decayed organic matter (15.96% and 20.95%), green algae (8.81% and 6.50%), macrophytes (5.06% and 9.09%), and blue-green algae (3.06% and 2.83%). The majority of benthic detritus suggests that the species has detritivores bottom-feeding tendencies. GaSI measurements showed seasonal variation in feeding intensity, ranging from 1.5±0.10 to 4.6±0.08 in the Burhi Gandak River and from 1.28±0.07 to 4.89±0.07 in Birauli Oxbow Lake, with greater values in the winter and post-monsoon. An omnivorous to herbivorous feeding behavior was suggested by the RGL values, which varied from 4.7–7.8 in the river and 4.1–6.5 in the oxbow lake. Habitat-based variation in feeding behaviour and food availability is shown by a substantial difference in RGL (P < 0.05) between the two environments. The results show L. gonius ecological adaptability and its critical function in benthic energy transfer in freshwater environments. These findings provide important insights into trophic dynamics and the sustainable management of inland fisheries resources.
Length–weight Relationship and Relative Condition Factor of Cyprinus carpio (Linnaeus, 1758) from Ottu Reservoir, Sirsa, Haryana
The length–weight relationship (LWR) and relative condition factor (Kn) of Cyprinus carpio from the Ottu Reservoir in Sirsa, Haryana, India, were studied in order to assess the species growth pattern and its physiological condition within the reservoir ecosystem. Using various fishing gear, fish samples (n = 260) have been collected from four sampling locations between January 2025 to December 2025. The body weight (g) and total length (cm) have been measured and evaluated using the cube law equation, W=aLb. Both sexes' length and weight were strongly correlated, with high coefficients of determination (R2 = 0.96) in the length-weight relationship. The female C. carpio showed positive allometric growth (b = 3.1605), indicating relatively larger weight gain relative to length, probably related to gonadal development, whereas males showed near-isometric growth (b = 2.9833), indicating proportional rise in weight with length. For both males (1.0055) and females (1.0192), the mean relative condition factor (Kn) was close to unity, reflecting generally good physiological condition and favourable conditions in the reservoir. There were seasonal differences in Kn, with relatively larger values in the spring and summer, possibly as a result of greater food availability and reproductive activity and slightly lower values in autumn and winter. Overall, the results reveal that C. carpio populations in the Ottu Reservoir maintain constant growth and a good condition of health, underscoring the reservoir's suitability and highlighting the significance of continuous monitoring for sustainable fisheries management and conservation.