Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 8 of 8 for “"estrus expression"”.
-
Increasing estrus expression in lactating dairy cows
… would increase occurrence and intensity of estrus. In experiment 1, cows (n = 154) were fitted with an AMS collar and a pressure-sensitive, rump-mounted device (HW) and assigned to 3 treatments: 1) CL only; 2) no CL + progesterone insert (CIDR); or 3) CL + 2 CIDR to achieve different …
-
The Effects of Preovulatory Estradiol on the Uterine Environment and Conceptus Survival From Fertilization to Maternal Recognition of Pregnancy
… protocol and AIed (d 0). Cows were classified by estrus expression (estrus and no estrus), and uteri were flushed to collect d16 conceptuses nonsurgically (Rep 1; n = 29), or following slaughter (Rep 2; n = 37). Uterine luminal fluid (ULF) was analyzed for protein, glucose, and interferon tau …
-
Supplementation of Chromium Propionate Positively Impacts Reproductive Performance of Beef Females
Return to estrus following the postpartum interval to achieve pregnancy success on time is a considerable obstacle for beef females. Chromium supplementation increases available glucose and insulin sensitivity within cells. Two experiments were conducted to investigate the effects of supplementing …
-
Factors affecting the quality and function of the bovine periovulatory follicle
… insemination programs, the detection of estrus prior to insemination has been shown to improve conception and decrease early embryonic loss. The impact of behavioral estrus expression on the oocyte and early embryo were evaluated. Oocytes were matured in vitro in follicle fluid collected …
-
Strategies to improve fertility of Bos taurus beef females enrolled in estrous synchronization protocols
… of this work was to determine the influences of estrus expression and timing of artificial insemination (AI), as well as temperament on fertility of Bos taurus beef females exposed to ES protocols. Multiparous cows (n = 1,676) were enrolled to the 7-d CO-Synch+ Controlled internal drug releasing …
-
Melatonin administration during the follicular phase and early pregnancy to minimize seasonal infertility in swine
… to delay puberty in gilts, increase wean to estrus interval in sows, and increase rates of pregnancy failure and reduced litter size. The array of seasonal problems associate with the confounded effects of both heat stress and changing photoperiod. Although the modern domesticated pig is …
-
Interaction of number of boar sperm and insemination timing on fertility following induced ovulation
Variability in estrus and ovulation requires multiple inseminations during estrus to ensure one AI occurs close to ovulation. Induction of ovulation with a GnRH agonist after weaning improves synchrony of ovulation and allows for fixed time AI. However, the interaction between number of sperm in …
-
Evaluation of the 7 and 7 synch protocol for control of the estrous cycle among beef cows prior to fixed-time artificial insemination with sex-sorted or conventional semen
… and PG coincident with CIDR removal on Day -3. Estrus detection aids were applied to all cows. Cows received FTAI 66 h after CIDR removal with conventional (20 x 106 cells per unit) or sex-sorted (4 x 106 cells per unit) semen. Estrus expression was affected by protocol (P = 0.01) by protocol x …