Determining the volume of an ejaculate is an important part of processing semen in bovine AI laboratory practice. A multi-AI laboratory study was performed to estimate the density of whole bull semen, and whether the use of this value as a standard is suitable for practical use when semen of different breeds is processed at different AI laboratories. The density of whole bull semen had been determined for 90 ejaculates at five AI laboratories (five breeds). The results showed no effect of bull (p=0.766), breed (p=0.279) and laboratory (p=0.183). All duplicate measurements within the same sample were within the level of agreement (5%). Using the mean value of 1.053g/ml as a golden standard for the density of whole bull semen is therefore suitable for use in routine bovine AI laboratory practice.
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http://dx.doi.org/10.1016/j.anireprosci.2014.02.015 | DOI Listing |
Chem Pharm Bull (Tokyo)
January 2025
Department of Life Science and Biotechnology, Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan.
Density functional theory calculations on the cyclization of di-t-butyl 2-(2-aminophenyl)-2-methyl malonate (1) to t-butyl 3-methyloxindole-3-carboxylate (2) reveal that acetic acid-assisted protonation of the carbonyl oxygen atom reduces the activation Gibbs free energy significantly lower than methanol-assisted pathways. Experimental data confirm that reaction concentration plays a pivotal role in oxindole formation. Experimental results also indicate distinct reaction mechanisms at low and high concentrations.
View Article and Find Full Text PDFMar Pollut Bull
January 2025
School of Resources and Environment, Nanchang University, Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang 330031, Jiangxi, China.
The widespread use of perfluoro/polyfluoroalkyl compounds (PFACs) makes it inevitable for them to be released into and affect the environment, and the octanol-water partition coefficient (logK) is a key indicator for evaluating the environmental behavior of trace pollutants and their impact on the environment. However, the determination of logK using experimental means is often time-consuming and laborious, or even unattainable. Therefore, the logKow of 20 per/polyfluoroalkyl compounds obtained from the PubChem database was selected as the object of study, and the 41 chemical descriptors required for modeling were obtained by density-functional theory calculations, and it was found that only two molecular descriptors (A, V) were significantly correlated with the logK, with the correlation of the descriptor A being the was the strongest.
View Article and Find Full Text PDFTrop Anim Health Prod
January 2025
Department of Clinical Sciences, Swedish University of Agricultural Sciences, Box 7024, 750 07, Uppsala, Sweden.
A cross-sectional study on 156 smallholder dairy farms in Rwanda was carried out to assess the association between farm management practices and milk yield and quality. A pre-tested questionnaire was used to collect data on cow characteristics and farm management practices. Milk yield was recorded at household level, milk composition was monitored using a Lactoscan device (Milk Analyzer).
View Article and Find Full Text PDFMol Reprod Dev
January 2025
Liv Hospital, Centre for Regenerative Medicine and Stem Cell Manufacturing (LivMedCell), İstanbul, Turkey.
In vitro maturation (IVM) is a form of assisted reproductive technology (ART) applied to obtain mature oocytes in culture. Decline in IVM success rates by age has led consideration of novel approaches based on cellular dynamics. Our aim was to achieve proteostasis in old bovine oocytes from 13 to 16-year-old bovine with a lower potential for fertilization.
View Article and Find Full Text PDFSci Rep
January 2025
Department of Chemistry, Devchand College, Arjunnagar, Kolhapur, MH, 591237, India.
Acoustical properties are essential for understanding the molecular interactions in fluids, as they influence the physicochemical behavior of liquids and determine their suitability for diverse applications. This study investigated the acoustical parameters of silver nanoparticles (Ag NPs), reduced graphene oxide (rGO), and Ag/rGO nanocomposite nanofluids at varying concentrations. Ag NPs and Ag/rGO nanocomposites were synthesized via a Bos taurus indicus (BTI) metabolic waste-assisted method and characterized using advanced techniques, including XRD, TEM, Raman, DLS, zeta potential, and XPS.
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