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<p>The aim of this research was to determine the quality of fresh milk physically, chemically and microbiologically obtained from cow, goats and buffalo in West Sumatra. The research method applied was laboratory experimental to analyze nutritional value, the number of aerobic bacteria and lactic acid bacteria, isolating and identifying lactic acid bacteria. Results showed that the nutritional value of milk had meet the requirements of Indonesian National Standardization, but the total colony of aerobic bacteria was above the allowed threshold of 1 x 10⁶ CFU/ml. In addition, each sample had a total colony of varied lactic acid bacteria (LAB). The lowest total LAB value obtained in cow's milk was 0.84±0.18 x10⁷CFU/ml, in contrast to buffalo milk and goat milk which had a higher total LAB of 36.8±17.57 x10⁷ CFU/ ml and 57.25±8.89 x10⁷ CFU/ml. However, all the colonies showed almost identical morphology of LAB isolates. It is concluded that fresh milk from West Sumatra contains LAB therefore sanitation control is still needed during handling of milk.</p>

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This research aimed to assess the effectiveness of nanocellulose biofilter (NCB) made from pineapple peel waste to reduce the number of microbes in water. Further processing of cellulose from nata de pina into nano size was proposed, then transformed into a filter membrane. Three types of NCB were developed: bacterial cellulose acetate membrane, bacterial cellulose acetate membrane with TiO2 treatment, and bacterial cellulose acetate membrane with TiO2 and graphite nanoplatelet treatment. These NCBs were used to filter microbes in several water sources in Padang City, West Sumatra Province. The filtering process was carried out using a filter holder where the NCB had been installed. The number of microbes contained in the water, including E. Coli, was determined before and after filtering. As a result, all NCBs reduced the total microbes in water by about 50%. Furthermore, when applied to water pollutant bacteria, E. Coli, all prepared NCBs reduced them by more than 90%. The effectiveness of all NCBs to remove microbes’ contamination, especially bacteria, looks very promising with or without TiO2 and graphene reinforcement. Although the efficacy of all NBC for microbial water purification was relatively similar, further experiments to clarify the superior of TiO2 and graphite nanoplatelet on NCB need to be carried out, especially in reducing chemical contamination.

The purpose of this study is to determine the quality of epididymis spermatozoa of buffalo after preservation with TALP media by adding serum with different level. The method used in this study is the experimental method and the design used is a randomized block design (RBD) with 3 treatment by adding bovine serum (0%, 5%, and 10%) and there are 6 replications as a group (repetition in the form of days). The result showed that the addition of serum into TALP diluent had a significant effect (P>0, 05) on the percentage of the motility of cauda epididymis spermatozoa of swamp buffalo after preservation which was 73, 33 in P2 10% serum and the viability is 79,167 ± 2,04 on P2 10%. This can be used as an indicator that the serum is effective in protecting spermatozoa from damages during the cryopreservation process, so by that, it would improve the quality of cauda epididymal spermatozoa of swamp buffalo. While the percentages of abnormality of cauda epididymis spermatozoa of swamp buffalo after preservation did not have a significant effect (P>0, 05). Based on the result of this study it can be concluded that the addition of 5% serum and 10% addition of egg yolk and 5% addition of glycerol will improve the quality of motility and viability and had no adverse effect on abnormalities after the preservation process at low temperature.