■冷冻保存精液可以充分发挥雄性动物的生殖优势。然而,在实际生产中,由于绵羊精液的抗冻性差,受胎率低,羊冷冻精液的推广受到很大阻碍。因此,提高精液的抗冻性是提高冷冻精液质量的当务之急。目前,大多数关于提高冷冻精液质量的研究都是基于精液稀释度的提高,通过饲喂功能性氨基酸提高羊精液抗冻性的研究较少。
■因此,将24只吐鲁番黑羊分为高防冻剂组(HF)和低防冻剂组(LF),每组进一步随机分为对照组和实验亚组。对照组饲喂基础饮食,而实验亚组在对照组的基础上额外接受12g/d的L-Cit补充剂,持续时间为90天。
■结果表明,补充L-Cit后,实验组精子密度和VSL(直线速度)显著升高,T-AOC,GSH-Px,新鲜精液中NO水平与对照组比较(P<0.01)。解冻后,实验组表现出明显较高的T-AOC水平,GSH-Px,NO与对照组比较(P<0.01)。此外,HFT组,冷冻精液解冻后,HK1蛋白表达明显高于对照组。精原细胞的数量,精母细胞,HFT组的精子细胞明显高于HFC组。此外,16SrRNA序列分析表明,葡萄球菌,Weissella,在HFT组的瘤胃中,菊科_UcG_002和Quinella显著富集,而HFC组的脲原体明显富集。在十二指肠,梭菌_细菌_公司_14,丁酸弧菌,和Prevotellaceae_NK3831_组在HFT组中显著富集,而在HFC组中,Desulfovibrio和Quinella显着富集。
■在本研究采用的条件下,发现补充L-Cit可以增强公羊的肠道菌群组成,从而提高精液质量,提高精液的防冻性能,促进睾丸生精细胞的发育。
UNASSIGNED: Cryopreservation of semen can give full play to the reproductive advantages of male animals. However, in actual production, due to the poor frost resistance of sheep semen and the low conception rate, the promotion of sheep frozen semen is greatly hindered. Therefore, it is urgent to improve the frost resistance of semen to improve the quality of frozen semen. At present, most studies on improving the quality of frozen semen are based on the improvement of semen dilutions, and few studies on improving the freezing resistance of ram semen by feeding functional amino acids.
UNASSIGNED: Therefore, 24 Turpan black rams were divided into high antifreeze group (HF) and a low antifreeze group (LF) Each of these groups was further randomly divided into control and experimental subgroups. The control subgroup was fed a basal diet, while the experimental subgroup received an additional 12 g/d of L-Cit supplementation based on the control group for a duration of 90 days.
UNASSIGNED: The results showed that Following L-Cit supplementation, the experimental group demonstrated significantly elevated sperm density and VSL (Velocity of straight line), T-AOC, GSH-Px, and NO levels in fresh semen compared to the control group (P < 0.01). After thawing, the experimental group exhibited significantly higher levels of T-AOC, GSH-Px, and NO compared to the control group (P < 0.01). Additionally, the HFT group, after thawing frozen semen, displayed significantly higher HK1 protein expression compared to the control group. The number of spermatogonia, spermatocytes, and sperm cells in the HFT group was significantly higher than that in the HFC group. Moreover, 16S rRNA sequence analysis showed that Candidatus_Saccharimonas, Staphylococcus, Weissella, succinivbrionaceae_UcG_002, and Quinella were significantly enriched in the rumen of the HFT group, while Ureaplasma was significantly enriched in the HFC group. In the duodenum, Clostridiales_bacterium_Firm_14, Butyrivibrio, and Prevotellaceae_NK3831_group were significantly enriched in the HFT group, whereas Desulfovibrio and Quinella were significantly enriched in the HFC group.
UNASSIGNED: Under the conditions employed in this
study, L-Cit supplementation was found to enhance the intestinal flora composition in rams, thereby improving semen quality, enhancing the antifreeze performance of semen, and promoting the development of testicular spermatogenic cells.