El estrés calórico es una desventaja para la producción de ganado en el trópico. La temperatura no único factor que modifica las constantes fisiológicas. En México, razas Simmental y Simbrah contribuyen a nacional carne diferentes zonas agroecológicas, por lo cual evaluar los factores ambientales modifican principales fisiológicas animales occidente México importante. Se utilizaron 341 ejemplares distribuidos 6 unidades producción. Con 147 pertenecientes raza 194 machos hembras con edad...

Probiotic supplementation in dairy cattle has achieved several beneficial effects (improved growth rate, immune response, and adequate ruminal microbiota). This study assessed the on parameters gut microbiota of newborn calves supplemented with two Lactobacillus-based probiotics, individually (6BZ or 6BY) their combination + 6BY), administrated same concentration (1 × 109 CFU/kg weight) at three times, between days 5 19 after birth. The control group consisted probiotic-unsupplemented...

In tropical, subtropical and arid zones, heat stress is the main cause of productivity reduction in cattle. When climate stressors occur, animals become thermal adapted through differential expression some genes, including shock proteins (HSP) family. The aim this study was to determine levels HSP60, HSP70, HSP90 genes Simmental cattle raised tropical environments Mexico.In study, analyzed 116 from three farms with located western Mexico. Animals were sampled twice a day, morning noon. Gene...

Para evaluar la respuesta ovárica a superovulación con dosis reducidas de hormona folículo estimulante (FSH) en bovinos Criollo Coreño, se realizaron dos experimentos el Sitio Experimental El Verdineño del INIFAP ubicado Nayarit, México. Se utilizaron 12 vacas 12.4 ± 2.9 años (Exp 1) y seis vaquillas 3.0 0.3 2). aplicaron tres tratamientos cada hembra: 280 mg (T1), 200 (T2) 140 (T3) FSH. Las variables evaluadas fueron número embriones transferibles (ET), corpúsculos recuperados...

Los objetivos fueron determinar la respuesta reproductiva de vaquillas Holstein en hatos lecheros pequeña escala a protocolos sincronización estros basado prostaglandinas (PG) benzoato estradiol (BE) y progesterona (P4). Vaquillas con al menos 13 meses edad (n= 138) aleatoriamente incluidas uno dos sincronización: PG) administración 500 mg cloprostenol i.m. día 0 14; PGPE) similar PG pero una aplicación adicional 100 P4 + 2 BE el 7. La tasa del grupo fue PGPE (84.3 vs 79.4 %; P>0.1). Las...

Objective: Evaluate the reproductive response of hair ewes treated with estrus synchronization protocols that included a progesterone-releasing intravaginal device (CIDR) for period 7 or 12 days. Methodology: During end winter, were randomly allotted to one two protocols: 1) Short-term protocol (SD), (n=24) received CIDR on Day 1 and removed 7, 400 IU equine chorionic gonadotropin (eCG) 0.125 mg cloprostenol; 2) Long-term (LD), 1, retired eCG. Ewes showing estrous behavior bred mature ram....

Objective: Characterize the feeding protocols and costs, as well their relationship with body development of lactating calves until weaning in family milk-production units (FMPU). Methodology: A prospective observational cohort study was carried out. The protocol, its cost were recorded, addition, daily gains weight (DWG) height (DHG) between birth 193 (n=12 FMPU). information subjected to descriptive statistics analysis variance. Results: In some FMPU, up 5 used, 49 138 days weaning....

SexedULTRA-4M™ is made using an improved method of sex-sorting sperm in a less damaging environment for better retaining integrity throughout the sorting process. The objective this research was to compare conventional (CONV) and (ULTRA-4M) semen bovine IVP four Angus bulls. Matured slaughterhouse oocytes (n = 4000) were divided into CONV group ULTRA-4M (2000 COCs each type). IVF process implemented with from same bull. cleavage rates, eight cell embryos blastocysts on day 7 culture...

El objetivo fue evaluar el impacto de factores asociados al manejo la madre y calidad del calostro sobre crianza reemplazos bovinos durante lactancia, en sistema producción leche a pequeña escala. En 13 unidades se obtuvo información crecimiento corporal, alimentación con e asociada 220 becerras Holstein. Las variables interés fueron: morbilidad, concentración inmunoglobulinas (CIC; <110 mg/ml), proteína sérica (CPS; <6.6 g/dl), ganancia diaria peso (GDP; <0.650 kg/día) altura (GDA;...

Colour-Doppler ultrasonography (CDU) has been applied for a more detailed examination of the ovary and uterus, mainly local blood flow in ovarian follicles corpus luteum (CL). The main use CDU is diagnosis early pregnancy or selection recipients embryo transfer cattle; however, this tool can also be used to select oocyte donors according ovary. concept that conducive healthier intraovarian environment (e.g. higher progesterone levels removal reactive oxygen species), yielding quality...

Reproduction, Fertility and Development is an international journal publishing original research , review comment in the fields of reproduction developmental biology humans, domestic animals wildlife

Implementing a fertility protocol such as Double-Ovsynch (DO) in commercial dairy farms represents an opportunity to improve reproductive performance.However, no studies have tested this nor identified factors that impact the first service conception rate (1SCR) technified highlands of western Mexico.The objective was identify 1SCR cows synchronized with DO protocol.Records from 4759 for their were used.To 1SCR, multiple logistic regression analyses performed main effects: days milk service,...

Desde que, en 1982 se consiguió el nacimiento de la primera cría generada a partir producción in vitro embriones (PIV), los avances esta tecnología no han detenido. La PIV ha sido tan exitosa que adaptado diversas especies, tanto productivas como fauna silvestre. Sin lugar duda mayor éxito ganado bovino, según datos reportados por Sociedad Internacional Tecnologías Embrionarias (IETS) durante año 2020. Este debe gran parte evolución sistemas cultivo y colección eficiente poco invasiva...

Reproduction, Fertility and Development is an international journal publishing original research , review comment in the fields of reproduction developmental biology humans, domestic animals wildlife

Reproduction, Fertility and Development is an international journal publishing original research , review comment in the fields of reproduction developmental biology humans, domestic animals wildlife

Reproduction, Fertility and Development is an international journal publishing original research , review comment in the fields of reproduction developmental biology humans, domestic animals wildlife

Reproduction, Fertility and Development is an international journal publishing original research , review comment in the fields of reproduction developmental biology humans, domestic animals wildlife

Sperm selection methods are routinely applied to prepare semen for IVF in animal species. These procedures used improve sperm quality characteristics as well remove other background material and debris. Percoll gradient is widely laboratories. Different concentrations volumes can be the sample motility percentage. The objective of this research was evaluate effect 2 different ovine effects, if any, on invitro embryo production (IVP). Specifically, gradients consisted Group 1 (G1) 40–80% (G2)...

SexedULTRA 4M™ (Select Sires) is made using an improved method of sex-sorting sperm in a less damaging environment for retaining integrity through the sorting process. The combination invitro embryo production (IVP) and sexed semen technologies has been successful intensity selection cattle industry. objective this research was to compare conventional (CONV) 4M (ULTRA-4M) bovine IVP 2 bulls. carried out reproduction laboratory at Palominos Ranch (Jalisco, México). performed with continuous...

Invitro embryo production (IVP) is an important tool for genetic improvement in small ruminants. Semen quality one of the most aspects to consider success this assisted reproductive technique. With ovine IVP, it a common practice use fresh semen IVF, but could be problem because differences between ejaculates from same animal are well documented and source variation IVP results. The objective research was compare effect frozen–thawed domestic sheep (Ovis aries) on IVF IVP. carried out...

Reproduction, Fertility and Development is an international journal publishing original research , review comment in the fields of reproduction developmental biology humans, domestic animals wildlife

Reproduction, Fertility and Development is an international journal publishing original research , review comment in the fields of reproduction developmental biology humans, domestic animals wildlife