Results 31 to 40 of about 40,862 (248)
Effect of increasing energy levels of diet and heat synchronization on steroid hormones and reproductive indices in Holstein heifers [PDF]
Āsīb/shināsī-i Darmāngāhī-i Dāmpizishkī, 2013 The aim of the present study was to determine the effects of increasing energy levels of diet and heat synchronization on steroid hormones and fertility in Holstein heifers.
akbar pirestani +3 more
doaj
The “costly son” hypothesis: Sons exacerbate obstetrical dilemmas in humans and other mammals
The Anatomical Record, EarlyView.Abstract Human childbirth has often been considered uniquely difficult among mammals, yet recent evidence suggests that obstructed labor and fetopelvic disproportion are widespread across placental mammals. Here, we propose the “costly son” hypothesis: because male offspring are typically larger at birth, they impose greater obstetric risk on mothers ...
Nicole D. S. Grunstra +1 more
wiley +1 more source
Modelling epidemiological and economic consequences of bovine respiratory disease in dairy heifers [PDF]
, 2001 Bovine respiratory disease (BRD) is an important health problem in dairy heifers. BRD causes considerable losses, particularly on farms that experience high levels of the disease. However, an exact quantification of the economic losses due to BRD was not
van der Fels-Klerx, H.J. +1 more
core
Follicle Stimulating Hormone in Cattle Breeding: Fundamentals, Innovations, and Scope
Animal Research and One Health, EarlyView.FSH is crucial in cattle reproduction, with exogenous administration enhancing breeding and embryo production. Recombinant FSH offers advantages over pituitary‐extracted variants, including fewer injections, reduced stress, and safer production. These innovations improve breeding efficiency, optimize reproductive outcomes, and contribute to sustainable
Muhammad Shahzad +7 more
wiley +1 more source
The association between age at first calving and survival of first lactation heifers within dairy herds [PDF]
, 2016 The objective of this research was to evaluate the survival rate of primiparous heifers within a large sample of herds across the UK and specifically to assess the association between age at first calving (AFC) on their survival.
Henderson, A. +3 more
core +1 more source
Northern bobwhites associated with native grass and shrubs have improved survival
The Journal of Wildlife Management, EarlyView.Survival rates of adult northern bobwhites were improved by a combination of grazed native warm‐season grasses and well‐interspersed shrubs. Our study suggests that incorporating native warm‐season grass cattle forages into existing operations across the southeastern United States may be a viable working‐lands conservation strategy to create habitat ...
Douglas B. Mitchell +5 more
wiley +1 more source
Effect of bovine leukemia virus infection and proviral load on the systemic profile of dairy heifers during the transition period [PDF]
Ciência Rural: This study aimed to evaluate the effect of bovine leukemia virus (BLV) on the systemic profile of naturally infected dairy heifers during the transition period. Pregnant Holstein and Jersey heifers (n=24) were distributed in pairs into two experimental
Fabrício Dias Torres +6 more
doaj +1 more source
Sustainable Development, EarlyView.ABSTRACT Achieving Agenda 2030 depends on addressing interactions between the sustainable development goals (SDGs). In this paper, we conceptualize SDG interactions as synergies or trade‐offs, incoming or outgoing, and internal or external, and analyze how SDG 2 (Zero Hunger) interacts with other SDGs within and across policy programmes that support ...
Annita Jepchirchir Kirwa +3 more
wiley +1 more source
Development of heirfers and dairy productivity of cows, doughters of different simmental breed bulls
Передгірне та гірське землеробство і тваринництво, 2022 Scientific-economical experiment on animals of Simmental cattle combined (dairy-meat) breed was carried out in TzOV «Litynske». A retrospective analysis was conducted and the milk productivity of cows and daughters of different bulls was studied.
V. Ya. DANKIV +2 more
doaj +1 more source
Docility and heifer pregnancy estimates in Angus heifers
Kansas Agricultural Experiment Station Research Reports, 2014 Introduction Reproductive success is economically relevant in beef cattle operations because the number of calves born influences the value of calves sold at weaning. Improvements in reproductive performance can be up to four times more important than improvements in end-product traits in an operation selling calves at weaning.
Kari L. White +3 more
openaire +2 more sources