Beef heifers with diminished numbers of antral follicles have decreased uterine protein concentrations.
Sign Up to like & getrecommendations! Published in 2017 at "Animal reproduction science"
DOI: 10.1016/j.anireprosci.2017.01.004
Abstract: Previous research demonstrated a favorable relationship between the number of follicles detectable in the bovine ovary by ultrasonography and fertility, and bovine females with diminished numbers of antral follicles had smaller reproductive tracts. Therefore, we… read more here.
Keywords: numbers antral; antral follicles; beef heifers; diminished numbers ... See more keywords
Effects of hydroxy trace mineral supplementation on gain and reproductive performance in beef heifers
Sign Up to like & getrecommendations! Published in 2021 at "Livestock Science"
DOI: 10.1016/j.livsci.2021.104425
Abstract: Abstract The objective of this study was to compare hydroxy to sulfate sources of Cu and Zn, on growth and reproduction in Angus-based beef heifers. Over a 2 year period, 200 Angus-based, spring-born heifers were… read more here.
Keywords: beef; trace mineral; period; effects hydroxy ... See more keywords
Cyclicity, estrus expression and pregnancy rates in beef heifers with different reproductive tract scores following progesterone supplementation.
Sign Up to like & getrecommendations! Published in 2020 at "Theriogenology"
DOI: 10.1016/j.theriogenology.2020.01.028
Abstract: Two experiments were conducted to determine effects of progesterone (P4) on cyclicity, estrus expression rate (EER) and artificial insemination pregnancy rate (AIPR) in beef heifers with various reproductive tract scores (RTS; 1 to 5; 1,… read more here.
Keywords: pregnancy; age; treatment; beef heifers ... See more keywords
Presynchronization with CIDR, with or without GnRH, prior to CO-Synch in beef heifers.
Sign Up to like & getrecommendations! Published in 2020 at "Theriogenology"
DOI: 10.1016/j.theriogenology.2020.02.005
Abstract: Objectives were to compare ovarian responses and pregnancy per AI (P/AI) in Angus-cross beef heifers (n = 521; 4 locations) synchronized with CIDR-CO-Synch (CCOS) versus CIDR-GnRH-CO-Synch (CGCOS) protocols. Heifers were assigned a reproductive tract score (RTS: 1,… read more here.
Keywords: group; cidr; beef heifers; synch ... See more keywords
Presynchronization with prostaglandin F2α and prolonged exposure to exogenous progesterone impacts estrus expression and fertility in beef heifers.
Sign Up to like & getrecommendations! Published in 2020 at "Theriogenology"
DOI: 10.1016/j.theriogenology.2020.02.010
Abstract: To determine the effects of two presynchronization strategies in conjunction with delayed fixed-time artificial insemination (TAI) on pregnancy rates to TAI (PR/AI), 1700 Angus beef heifers at three locations in South Dakota were enrolled in… read more here.
Keywords: exogenous progesterone; beef heifers; day; prolonged exposure ... See more keywords
Nutritional parameters of beef heifers fed diets with different roughages
Sign Up to like & getrecommendations! Published in 2017 at "Animal Production Science"
DOI: 10.1071/an16721
Abstract: The purpose of this study was to evaluate intake, digestibility and efficiency of microbial protein synthesis of beef heifers fed with sugarcane silage with different calcium oxide (CaO) levels (0, 7.5; 15 g/kg), fresh sugarcane… read more here.
Keywords: intake; silage; sugarcane; beef heifers ... See more keywords
Attainment and maintenance of pubertal cyclicity may predict reproductive longevity in beef heifers†
Sign Up to like & getrecommendations! Published in 2021 at "Biology of Reproduction"
DOI: 10.1093/biolre/ioab044
Abstract: Abstract We hypothesized the manner that heifers achieve puberty may indicate their future reproductive longevity. Heifers with discontinued or delayed cyclicity during puberty attainment may have irregular reproductive cycles, anovulation, and infertility in their first… read more here.
Keywords: non cycling; reproductive longevity; beef heifers; cyclicity ... See more keywords
201 Effects of feeding vitamin and mineral and (or) energy supplements to beef heifers during the first 83 days of gestation on progesterone concentrations, corpus luteum size, and fetal body measurements
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Animal Science"
DOI: 10.1093/jas/skaa278.296
Abstract: Our objectives were to determine the effects of feeding vitamin and mineral (VTM) and (or) energy (NRG) supplements to beef heifers during the first 83 days of gestation on concentrations of progesterone (P4), corpus luteum… read more here.
Keywords: gestation; effects feeding; vitamin mineral; energy ... See more keywords
Comparison of two alternate PGF2α products in two estrus synchronization protocols in beef heifers.
Sign Up to like & getrecommendations! Published in 2018 at "Journal of animal science"
DOI: 10.1093/jas/sky059
Abstract: Two experiments were conducted to evaluate the effects of a high concentrate, s.c. PGF2α compared with a conventionally concentrated, i.m. PGF2α in estrus synchronization protocols for heifers. In Exp. 1, 869 Angus-based beef heifers were… read more here.
Keywords: control hicon; beef heifers; estrus synchronization; pgf2 ... See more keywords
A randomized trial and multisite pooled trial analyses comparing effects of two hormonal implant programs and differing days-on-feed on carcass characteristics and feedlot performance of beef heifers
Sign Up to like & getrecommendations! Published in 2022 at "Translational Animal Science"
DOI: 10.1093/tas/txac162
Abstract: Abstract Research objectives were to evaluate effects of two implant programs for beef heifers fed three different durations (days-on-feed; DOF) on carcass weight and composition (primary outcomes) and feedlot performance (secondary outcomes) at commercial feedlots.… read more here.
Keywords: carcass; dof; effects two; implant programs ... See more keywords
Loci associated with conception rate in crossbred beef heifers
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DOI: 10.1371/journal.pone.0230422
Abstract: The inability of beef cattle to maintain full term pregnancies has become an economic concern for the beef industry. Herd management and nutritional improvements have alleviated environmental impacts on embryonic and fetal loss, yet additional… read more here.
Keywords: beef; conception; beef heifers; crossbred beef ... See more keywords