Agricultural Science 2021-09-24T10:56:13+08:00 Eric Johnson Open Journal Systems <p><em>Agricultural Science</em>&nbsp;(ISSN 2690-5396 e-ISSN 2690-4799) is an international, double-blind peer-reviewed, open-access journal, published by the IDEAS SPREAD&nbsp;in United States. It publishes original research, applied, and educational articles in all areas of agricultural science.&nbsp;Agricultural Science (AS) is quarterly, published in March, June, September and December.<br> <em>Agricultural Science</em> is striving to provide the best platform for researchers and scholars worldwide to exchange their latest findings. Authors are encouraged to submit complete, unpublished, original works that are not under review in any other journals. The journal is published in both print and online versions, and the online version is available for free.</p> The Solar-Heat Pump Combined Drying Characteristics and Dynamic Model of Kelp Knots 2021-08-29T16:14:10+08:00 Yang Li Zicheng Hu Yongguang Hu Fenghua Ge Hongzhi Cai <p>For controlling the entire drying process of a material, it is crucial to understand the moisture ratio of the material in the drying process. In order to ascertain the moisture change rules of kelp knots in the solar-heat pump combined drying process, an analysis was made on the impacts of different drying temperatures, wind speeds and loading capacities on the drying rate in this research; meanwhile, three common drying dynamic models were selected and compared to know their applicability to the solar-heat pump combined drying of kelp knots. Further, the model coefficient was determined and the optimal model was obtained. The results reveal as follows: drying temperature, wind speed and loading capacity have significant impact on and significant correlation (P&lt;0.05) with the drying rate of kelp knots; under different drying conditions, the drying rate is always high in the early stage, lowered and gradually moderate in the later stage. After fitting the drying dynamic model, it is found that among the experimental data, regression coefficient (<em>R<sup>2</sup></em>) is the largest in the Verma model, and the sum of squares for error (<em>SSE</em>) and root mean square error (<em>RMSE</em>) are low. This indicates that the Verma model can be used to accurately express and predict the change rules of moisture in kelp knots during the solar-heat pump combined drying. According to Fick's second diffusion law, the effective diffusion coefficient <em>Deff</em> increases with the increase in drying temperature and wind speed, and decreases with the increase in loading capacity.</p> 2021-08-29T00:00:00+08:00 ##submission.copyrightStatement## The The Efectiveness of Jamblang (Syzygium cumini) Leaves Extract Inclusion Skim Milk-Egg Yolk Extender on Motility and Viability of Aceh Cattle Spermatozoa during Pre-Freezing and Post-Thawing 2021-09-24T10:56:13+08:00 Cut Intan Novita Faqihuddin Nasution Eka Meutia Sari <p>The process of semen freezing causes an increase in free radicals concentration which can damage spermatozoa. The addition of natural ingredients in semen diluent is expected to solve this challenges. One of the natural ingredients that can be used is <em>jamblang </em>(Syzygium cumini) leaves. The objective of the current study was to investigate the quality of spermatozoa in Aceh cattle which was added with <em>jamblang </em>leaves extract in skim milk- egg yolk extender during pre-freezing and post-thawing. This study applied Completely Randomized Design (CRD) with 5 treatments and 5 replications. The treatments consisted of J0 = skim milk-egg yolk; J1 = skim milk-egg yolk + <em>jamblang</em> leaves extract 0.2%; J2 = skim milk-egg yolk + <em>jamblang</em> leaves extract 0.4%; J3 = skim milk-egg yolk + <em>jamblang</em> leaves extract 0.6%; and J4 = skim milk-egg yolk + <em>jamblang</em> leaves extract 0.8%. The parameters observed in this study were the percentage of motility and viability of frozen semen of Aceh cattle. The data obtained were analyzed using Analysis of Variance (ANOVA) and if differences were found, then it would be continued with Duncan's Multiple Distance test. The results showed that the addition of <em>jamblang</em> leaves extract in egg yolk skim milk significantly affected the percentage of motility during pre-freezing and post-thawing, significantly affected spermatozoa viability during pre-freezing and significantly affected the spermatozoa viability during post-thawing. J3 treatment (<em>jamblang</em> leaves extract 0.6 gram/100 ml) it should be higher than the other treatment, where the percentage of motility at pre-freezing and post-thawing were 55.48% and 52.71%, respectively, and the percentage of viability during pre-freezing and post-thawing were 56.59% and 53.94%, respectively. It was concluded that the addition of <em>jamblang</em> leaves extract in the skim milk-egg yolk extender affected the percentage of spermatozoa motility and viability of Aceh cattle during pre-freezing and post-thawing.</p> 2021-09-24T00:00:00+08:00 ##submission.copyrightStatement##