A5058910659- Reproductive Physiology in Livestock
- Genetic and phenotypic traits in livestock
- Ruminant Nutrition and Digestive Physiology
- Effects of Environmental Stressors on Livestock
- Reproductive Biology and Fertility
- Animal health and immunology
- Reproductive System and Pregnancy
- Livestock Management and Performance Improvement
- Food Security and Health in Diverse Populations
- Food, Nutrition, and Cultural Practices
- Maternal and Neonatal Healthcare
- Agricultural Economics and Policy
- Phytase and its Applications
- Protein Hydrolysis and Bioactive Peptides
- Rabbits: Nutrition, Reproduction, Health
- Gender, Labor, and Family Dynamics
- Digestive system and related health
- Rural Development and Agriculture
- Ovarian cancer diagnosis and treatment
- Agronomic Practices and Intercropping Systems
- Ovarian function and disorders
- Animal Nutrition and Physiology
- Animal Nutrition and Health
- Animal Genetics and Reproduction
- Food Industry and Aquatic Biology
University of Wisconsin–Madison
2016-2025
Universidade de São Paulo
2016-2025
Núcleo de Pesquisas Aplicadas (Brazil)
2023-2025
Our objective was to evaluate the effects of providing increasing levels chitosan on nutrient digestibility, ruminal fermentation, blood parameters, nitrogen utilisation, microbial protein synthesis, and milk yield composition lactating dairy cows. Eight rumen-fistulated Holstein cows [average days in lactation = 215 ± 60.9; average bodyweight (BW) 641 41.1 kg] were assigned into a replicated 4 × Latin square design, with 21-day evaluation periods. Cows be provided four chitosan, placed...
Fertility programs were implemented for the first postpartum timed-AI (TAI) in 800 (primiparous and multiparous) lactating dairy cows, evaluating 2 presynchronization (presynch) strategies TAI protocols, a × factorial arrangement. Weekly, cows enrolled into 1 of 4 groups (Ovs+Ovs [Double-Ovsynch], Ovs+OvsP4/E2, PreP4/E2+Ovs PreP4/E2+OvsP4/E2 [Double E-Synch). On d -17 (34 ± 3 milk), Ovs presynch was initiated with 10 µg buserelin acetate (GnRH), received 0.5 mg cloprostenol sodium (PGF) on...
Changes in circulating progesterone (P4) and estradiol (E2) during proestrus produce dynamic changes endometrial function pituitary release of gonadotropins. Independent combined effects P4 E2 on endometrium were evaluated. In a preliminary study, an exogenous hormone model was created by removal corpus luteum follicles ≥5 mm followed gradual intravaginal implants 18 h treatment with increasing doses benzoate 48 to mimic using high (n = 9) or low 9). Decreased P4, increased E2, area (EA)...
This study aimed to determine the effect of circulating progesterone (P4) concentrations produced by a corpus luteum (CL) or released an intravaginal P4 implant (IPI) on GnRH-induced LH release, ovulatory response, and subsequent CL development, after treatment with 100 μg gonadorelin acetate (GnRH challenge). Nonlactating multiparous Holstein cows were synchronized GnRH was used induce ovulation (d −7). Over 4 replicates, that ovulated (n = 87) randomly assigned 2 × factorial arrangement...
The present study compared 2 strategies to initiate a progesterone (P4)-based timed artificial insemination (TAI) protocol for lactating dairy cows: only GnRH or estradiol benzoate (EB) plus (EB+GnRH). Lactating Holstein cows (n = 487; 184 primiparous and 303 multiparous) from commercial herds were used their second greater services postpartum. Each week, that nonpregnant at the pregnancy diagnosis 32 d after previous AI randomly assigned 1 of experimental groups differed in strategy (d 0)...
We investigated the effect of an additional GnRH 2 d after initiation resynchronization on 25 post-AI proportion cows without a corpus luteum (CL) at nonpregnancy diagnosis (NPD) and pregnancy per AI (P/AI) with CL NPD that were reinseminated. Once week, inseminated earlier randomly assigned to receive either treatment only (G25) or this day later (G25&27). Pregnancy presence determined 32 using ultrasonography. Nonpregnant enrolled in different strategies for ovulation according parity...
The study evaluated strategies for induction of ovulation at the end timed-artificial insemination (TAI) protocols initiated after a novel presynchronization strategy. A total 909 lactating dairy cows from 6 herds protocol on d -15 with an intravaginal progesterone (P4) implant and 7 later (d -8) were treated 1.0 mg estradiol cypionate (EC) 0.530 cloprostenol sodium (PGF), simultaneously P4 removal. On 0, synchronization was 16.8 µg buserelin acetate (GnRH) insertion 2.0 g implant, followed...
The main objective of the present study was to determine whether composition total mixed ration influences reproductive performance in high-producing commercial dairy farms. Dairy producers and nutritional consultants from 48 farms located Wisconsin agreed provide data dietary information on high milk production pens during breeding period for previous 12 mo. Dietary components (percentage dry matter) were crude protein (CP), rumen degradable (RDP) undegradable (RUP) protein, neutral...
Inappropriate corpus luteum (CL) regression can produce pregnancy loss. An experimental model was utilized to investigate of accessory CL during in dairy cows. Cows were bred (day 0) and treated with gonadotrophin-releasing hormone 6 days later form CL. Transrectal ultrasound (every other days) blood samples for progesterone (P4; daily) performed until day 56 pregnancy. On 28, 13 cows confirmed pregnant, found contralateral (n = 9) or ipsilateral 4) previous ovulation. 18, biopsy analyze...
Implementing an efficient reproductive program, which combines the intensified use of timed artificial insemination (TAI) with a well-adjusted breeding season (BS), can optimize farm operations, enhance genetic potential and herd performance, maximize production profits. Additionally, resynchronization strategies optimized TAI protocols further improve efficiency system. Increasing productivity in beef cattle systems involves more than just pregnancy rates by end BS. It’s equally important...
Our objective was to improve ovulatory response at the initiation of Resynch-25 protocol by (1) increasing dose GnRH from 100 µg 200 µg; and (2) giving a second treatment 56 h after protocol. We considered experimental d 0 day previous service. The experiment consisted 2 × factorial design compare main effects (100 vs. µg) times (once twice apart). A total 2,111 services in 1,438 Holstein lactating cows were used. On d25, assigned receive either or only on d25 later (d27). 32, diagnosed as...