A5062911994- Reproductive Physiology in Livestock
- Genetic and phenotypic traits in livestock
- Reproductive Biology and Fertility
- Sperm and Testicular Function
- Effects of Environmental Stressors on Livestock
- Veterinary Equine Medical Research
- Ruminant Nutrition and Digestive Physiology
- Animal Behavior and Welfare Studies
- Animal health and immunology
- Reproductive Health and Technologies
- Animal Genetics and Reproduction
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Male Reproductive Health Studies
- Livestock Management and Performance Improvement
- Seed Germination and Physiology
- Vector-Borne Animal Diseases
- Rural Development and Agriculture
- Hormonal and reproductive studies
- Bee Products Chemical Analysis
- Reproductive biology and impacts on aquatic species
- Milk Quality and Mastitis in Dairy Cows
- T-cell and Retrovirus Studies
- Assisted Reproductive Technology and Twin Pregnancy
- Urological Disorders and Treatments
- Aquaculture Nutrition and Growth
Pontifícia Universidade Católica do Paraná
2016-2025
Pontifical Catholic University of Puerto Rico
2004-2015
Universidade Federal do Paraná
1998-2014
Technical University of Munich
1985-1986
Universidade Estadual Paulista (Unesp)
1978-1981
Núcleo de Pesquisas Aplicadas (Brazil)
1981
ABSTRACT This study aimed to evaluate the efficiency of recombinant bovine somatotropin (rbST) on pregnancy rate (PR), dominant follicle diameter (DFD) pre-ovulatory (DFPO), and follicular growth (FGR) in Bos indicus cows with low body condition score (BCS; mean = 2.3) subjected fixed-time artificial insemination (FTAI) protocols. The females were divided into four groups: rbST group day zero (GbSTd0; n=31) received a progesterone (P4) intravaginal device + estradiol benzoate d0 protocol;...
The aim of this study was to determine the influence collagen I and III on expression estrogen progesterone receptors in equine endometrial fibrosis. A total 25 crossbred mares were studies. Two samples collected from each mare,1 inthe estrus and1 diestrus phase. classified according histological changes. Collagen typed quantified using picrosirius red histochemical technique, steroid identified by immunohistochemistry. results showed a predominance type all samples. (RE2) (RP4) varied...
Contents Multiple ovulation and embryo transfer (MOET) is an important tool in the sheep industry for increasing numbers of genetically superior individuals. The objective this study was to evaluate effect semen source (frozen or fresh), number collection procedures each donor (NECP), season which performed, age breed donor, on recovered embryos pregnancy rates after transfer. Alamos Genetics’ flushing station database used. This consisted 140 procedures, from 53 Dorper White donors, aged...
The study evaluated the reproductive performance of Ile de France, Texel, Suffolk and crossbred ewes in different seasons, considering season mating, age, body condition score breed. herd was located at geographic coordinates -25.66114429 S, -49.27262198 W, Fazenda Rio Grande, Paraná State, southern Brazil, a semi-intensive system. 643 mating were evaluated, under natural oestrous conditions 10 consecutive breeding seasons (2015-2019), between 2.5 3.5 93.9%. Data analysed using Chi-square...
The aim of this study was to evaluate the viability bull spermatozoa collected from cauda epididymis stored at 18-20°C, which were compared with semen by electro-ejaculation method and preserved 5°C. Ten pairs testes Tabapuã bulls removed orchiectomy for 6 (G6), 12 (G12), 18 (G18), 24 (G24) 30 (G30) h room temperature (18-20°C). Seven days before orchiectomy, method. sperm parameters evaluated were: motility, vigor, concentration, morphology acrosome defects. Sperm motility declined (p<0.05)...
This study aimed to compare the pregnancy rate using conventional artificial insemination (AI) or deep intracornual (DIAI), with low number of spermatozoa (4.0 million sperm) in 270 Nelore cows. The animals were divided two groups (G: G1 (135 cows) AI was performed (=semen deposition uterine body) and G2 DIAI, ipsilateral horn where dominant follicle ovary had previously been detected, by ultrasound examinations. For both methods, a single carried out after visual estrus observation, checked...
Two experiments were conducted to determine the effect of administering PGF2α at initiation 7-d CO-Synch+controlled internal drug release (CIDR) fixed-timed AI (TAI) protocol on pregnancy rates suckled beef cows and replacement heifers. Within location, stratified by days postpartum (DPP), BCS, parity (Exp. 1; n = 1,551) heifers BCS 2; 999) randomly assigned 1 2 treatments: 1) CO-Synch+CIDR (100-μg injection GnRH CIDR insertion [d –10] with a 25-mg removal –3] followed TAI d 0) or 2)...
Abstract This study evaluated the effect of bovine somatotropin (bST) on pregnancy rate (PR) and size dominant follicle (DF) day intravaginal progesterone (P4) removal in protocols for fixed‐time artificial insemination (FTAI). Bos indicus (Nellore) females ( n = 392) were distributed into three groups. The control group (CG; 92) received an P4 device + estradiol benzoate (d)0; prostaglandin F2α d7 (first application); cypionate (EC) PGF2α (second application) ultrasound (US) DF d9; FTAI was...
The aim of the present paper was to investigate efficiency equine chorionic gonadotropin (eCG) plus human (hCG) associated with medroxyprogesterone acetate (MAP) estrous ewes synchronization. Ninety Texel were investigated during seasonal anoestrous. received intravaginal sponges containing MAP (60 mg) for nine days. At time sponges' withdrawal, divided into three groups (G): (1) receiving 2 mL saline i.m. (n = 30), (2) eCG 400 IU and (3) hCG 200 30). Twelve h after removal, teaser rams used...
The aims of this study were to compare the viability and in vivo vitro fertilization potential post-thaw sperm collected at different times postorchiectomy from bull epididymides (EP) 18 °C 20 °C, with those semen by electroejaculation (EJ) same bulls. Semen samples EJ 10 Zebu bulls cryopreserved. A week later these obtained orchiectomy randomly divided into five groups (G) be maintained ambient temperature for 6, 12, 18, 24, 30 hours before recovery retrograde flow. cryopreserved,...
This study investigates the effect of time storage epididymides at room temperature and addition 20% seminal plasma to cryopreservation extender, on post thaw quality fertility ovine spermatozoa collected from cauda epididymis. Spermatic kinetics, integrity stability membrane, damage acrosome following laparoscopic artificial insemination were evaluated in samples an vagina (AV) stored for zero (G0), six (G6), twelve (G12), twenty-four (G24) forty-eight (G48) hours mortem. There no...
The study aimed to determine the impact of equine chorionic gonadotropin (eCG) associated with different timed artificial insemination (TAI) protocols on pregnancy rate (PR) in Bos indicus cows previously treated progesterone. Five hundred and fifty-seven primiparous were subjected following treatments: day 0 (d0), GeCGTW (group Chorionic Gonadotropin+Temporary Weaning;n=178) received 0,558 g intravaginal progesterone (P4)+1.0 mg estradiol benzoate (EB) (IM); d8 (P4 removal+0,075...
The aim this study was to compare two protocols of induction for ovulation by desloreline acetate and hCG in Quarter Horse mares. choice the animals based on observations estrus, rectal palpation ovaries ultrassonography follicular dynamics. After estrus detection follicle control, measurement follicles classification uterus were carried out. that had dominant (diameter more than 35 mm) swollen used. In these conditions, mares received or acetate. Once occurred, artificial insemination...
A recuperação e a criopreservação de espermatozoides do epidídimo constituem alternativas viáveis para preservação material genético animais valiosos. O objetivo deste estudo foi comparar o desempenho dois diluentes comerciais Botu-Bov(r) (BB) Bovimix(r) (BV), sobre viabilidade pós-descongelação touros Tabapuã (Bos taurus indicus) pós-castração. Os foram colhidos da cauda 20 epidídimos utilizando técnica fluxo retrógrado, centrifugados diluídos com BB ou BV posterior -196°C. Após...
Neste experimento foram utilizados 10 garanhões com o objetivo de avaliar alguns parâmetros viabilidade espermatozóidescolhidos mediante vagina artificial antes da orquiectomia, bem como proceder a comparação os espermatozóides colhidos lavagem cauda epididimária, após submeter animais à orquiectomia bilateral. Relativamente às célulasespermáticas constituíram-se três grupos: 1. colhido (VA); 2. do epidídimo esquerdo; 3. e direito. Os pesquisados para avaliação espermática temperatura...
The aim of this work was to study estrus synchronization and fixed time artificial insemination (FTAI) in dairy buffaloes during season anestrus. One hundred thirty-nine seasonal anestrus were divided two groups as G1(n=66) G2(n=73). protocols for both the same until day (D)14:D0 administration 2.0 mg estradiol benzoate implantation progesterone device (P4) 14 days; D14 removal P4 plus 150 cloprostenol 400 IU equine chorionic gonadotropin. On D16, G1 received 10 buserelin G2 100 deslorelin...
Inhalt Der Einfluβ zweier Haltungssysteme auf den puerperalen und nachpuerperalen Abschnitt wurde bei 72 Kühen (32 in der Anbindehaltung 40 Laufstallhaltung) untersucht. Die rektale vaginale Kontrolle erfolgte von Geburt an fünf‐ bis siebentägigen Abständen, die Milchprobenentnahme für Progesteronbestimmung dreitägigen Intervallen zum 72. Tag p.p. Für im Milchfett Enzymimmuntest eingesetzt, sich Vorversuchen Parallelmessungen 360 Proben mit dem Radioimmuntest ein Korrelationskoeffizient r =...
The study aimed to evaluate the effect of double administration a progesterone (P4) intravaginal device on induction ovarian cyclicity in mares.Twelve crossbred mares were assigned one two groups.The first group (GP4; n = 6; 100 % anestrus phase) underwent following protocol: day (d) 0, 1.9 g P4 + ultrasound uterus and ovaries (US); d 7, US; d10, P 4 removal d10 -d 24, US daily; 28, second P4; 35, 40, 40 54, 54 76, every other day.The (GNP4; 5; transition same protocol as GP4, but without...