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Bucks reproductive performance can be improved by artificial insemination technique, that affected by many factors the most important one is semen quality, which is affected by the methods of semen preservation cooling and freezing. The goal of this study was to assess the effect of adding different concentrations of antioxidant as Nano-selenium to the diluted buck semen during preservation by cooling in both summer and winter seasons. Eight mature healthy Zaraibi bucks were used in the study. Semen samples were collected by an electro- ejaculator twice per week during summer 2021 (August, September) and winter (January, February). Samples were pooled and diluted by extender then divided to experimental groups: Group 1: Nano-selenium: 100 μL /100 ml and Group 2: 200 μL / 100 ml. Then the groups cooled for measuring some semen parameters and seminal antioxidant activities after 1 h from adding and at 8 hours then every 8 hrs up to 64 hr. Nano selenium 200 μL /100 ml has a favorable impact on diluted buck semen during cooling preservation during summer and winter. [ABSTRACT FROM AUTHOR]

This work aimed to study the influences of different extender types on the quality and fertilizing capacity of stallion semen to determine the best extender which may enhance the fertilization capacity of stallion semen. Three healthy stallions aged 4-10 years and sixty mares aged 3-12 years were selected after the breeding soundness examination to accomplish this study. All the animals were with a good general health condition without any history of reproductive failures or disturbances. The external and internal genitalia were examined using the rectal palpation and ultrasonography to avoid any disturbances in the reproductive tract that might affect mare’s fertility. Semen samples were collected using artificial vagina and was evaluated, then diluted by four types of extenders (botusemen, botusemen special, botusemen gold and botusemen turbo ) and used for mares insemination to determine the influence of extender on quality of semen and conception rate.This study concluded that, the extenders types can influence the fertilizing capacity in mares through its effect on active forward motility of the sperm, dead and live sperm % and the conception rate. The extenders that contain skimmed milk could increase the fertility and conception rates of stallion semen. [ABSTRACT FROM AUTHOR]

This study was carried-out to throw the light on the effect of some biostimulants as L-carnitine; 0.1mg/ml, Omega 3; 10 ng/ml and moringa olifera; 100 μg/ml on sperm progressive motility and livability percentages, abnormalities, acrosomal integrity of rams semen cooled in refrigerator (+5) during different periods (0,24,48,72,96 hrs) in different extender [Egg yolk citrate extender 10% egg yolk (EG) (1st dil), tris based extender 2.5% EG (2nd dil), tris based extender 10% EG (3rd dil) ]. The results indicated that, the best treatment group that improved the sperm abnormalities and acrosomal integrity % observed in L-carnitine treated group followed Omega3-treated group and the least treatment observed in Moringa olifera treated group. The best treatment improved the progressive sperm motility and livability percentage of sperm cells observed in the groups treated with Omega-3, followed moringa olifera and the least observed in L-carnitine treated group, also the best diluent is tris-based extender 10% egg yolk (3rd) the results also cleared that, by increasing the time of cooling there is a decrease of sperm quality and its ability to conception. It could be concluded that, the biostimulants used in this study specially Omega-3, and moringa olifera in tris-based extender 10% egg yolk (3rd) improved semen quality of rams preserved at refrigerator for 4 days specially. [ABSTRACT FROM AUTHOR]

This work aimed to evaluate different protocols for estrous synchronization on beef cattle to decrease the period of calving interval and to decrease the cost of breeding by using different way of estrous synchronization to determine the best protocol used in synchronization in Egypt. In this research, we used 102 beef (Angus, Herford and their crosses) cows and heifers 51 cows (21suckling cows,30 non lactating cows) all cows are cycling 60days after parturition and 51cycling heifers age above 1.5 years and 10 bull for mating divided into 5 groups. first group (GnRH-CIDR- PGF2α) second group (CIDR- PGF2α) third group(G-P-G) forth group (PG-PG) and the fifth one is a control group. The best result is the third group with a percent of 61.1% then the second and forth group with 50% then the first group with40% and the last one is the control one with 27.8%. From this work we concluded that the simple protocol of estrous synchronization in Egypt which is Receptal–Lutalase–Receptal (G-P-G) is the best protocol to use in this experiment. [ABSTRACT FROM AUTHOR]

The aim of this study was to evaluate the effect of the hormonal treatment during early postpartum period on the days open, serum progesterone hormone levels at 28 and 42 days post injection and pregnancy percentage following different hormone protocols in multiparous and primiparous buffaloe- cows. The experiment was carried out on 65 (40 multiparous -25 primiparous) clinically healthy animals, randomly allotted into five groups: each (n=8) multiparous and (n=5) of primiparous. The first group; received saline 0.9% intramuscular at day 14 postpartum (control). The second group; injected by 5 ml Receptal (20 µg Buserelin ) at day 14 post-partum. The third group; injected by 5 ml Receptal at day 14 post-partum and day 21 then 3ml Estrumate (750 µg cloprostenol) at day 28. The fourth group received 2 vials of Gonaser (1000 IU eCG) at day 14 post-partum. The fifth group injected by 1000 IU eCG at day 14 post-partum, and at day 21 receive 5 ml Receptal then 7 days later at day 28 receive 3ml Estrumate. Fertile bulls were ensured for all buffaloes. Blood samples collection were performed at the days 28 and 42 day from treatment for serum progesterone levels determination. Ultrasound pregnancy check was done at day 40-45 days later. The present study demonstrated that group 4 has significant (P>0.05) decrease of the current days open than other groups of multiparous buffalo and have lower significant (P < 0.01) difference from previous days open and Primiparous buffaloes. Meanwhile, control group showed the highest current days open (113.3 ± 4.4) compared to other groups of multiparous buffalo cows and have significant (P < 0.05) difference from primiparous buffalo cows. Highly significant (P < 0.05) differences in serum progesterone concentration at 28 and 42 day among groups of multiparous buffalo cows where, group 4 at 28 day had greater (0.56±0.11 ng/mL) concentration than both group 2 (0.31±0.07 ng/mL) and group 3 (0.29±0.06 ng/mL). No significant differences in percentages of pregnancy rates within multiparous and primiparous buffaloes but group 1 and group 3 of primiparous buffaloes had the lowest pregnancy rate percentage compared to other groups. In conclusion, the application of hormonal treatment during early postpartum period at day 14 postpartum especially group 4 resulted in decreased days open and could be used for improvement of the reproduction in postpartum buffaloe-cows. [ABSTRACT FROM AUTHOR]