Managing the reproductive performance of beef cows

Diskin, M.G.; Kenny, David A.

doi:10.1016/j.theriogenology.2016.04.052

Cited by 88 publications

(85 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Inadequate dietary energy supply during late gestation impairs reproduction, even when it is sufficient during lactation. Hence, there is clear evidence that supplementation of beef cows pre-partum is more important than postpartum [3,4].…”

Section: Introductionmentioning

confidence: 99%

Performance, metabolic and hormonal responses of grazing Nellore cows to an energy-protein supplementation during the pre-partum phase

et al. 2020

View full text Add to dashboard Cite

Background: Supplementation programs for prepartum beef cows are usually adopted because the nutritional status of the cows upon calving is a main factor impacting reproductive performance of the next production cycle. This study evaluated the effects of 60-d pre-partum energy-protein supplementation on performance, metabolic and hormonal responses during the peripartum phase of grazing beef cows. Thirty-eight pregnant multiparous Nellore cows were assigned to a completely randomized design with two treatments: control (no supplement) and supplementation (1.5 kg of energy-protein per d with 30% crude protein, dry matter basis). Results: The supplemented cows had higher ADG pre-partum (P < 0.10), but postpartum ADG did not differ between treatments. Supplementation did not affect BCS and calf BW upon calving, on days 45 and 90, milk yield and composition (P > 0.10). No differences were found for forage intake and neutral detergent fiber digestibility (P > 0.10). The intake and digestibility of CP and OM increased in response to supplementation (P < 0.10). An interaction occurred between supplementation and peripartum days for BUN, βHB, T3 and T4, which had higher concentrations for supplemented cows at pre-partum period (P < 0.10). Concentration of others blood parameters significantly changed along peripartum days (P < 0.10). There was no difference in pregnancy rates and days from calving to conception between treatments (P > 0.10). Conclusions: Providing an energy and protein supplement to grazing Nellore cows over the last 60 d of gestation improved their pre-partum energy balance. However, no post-partum carryover effects were detected.

show abstract

Section: Introductionmentioning

confidence: 99%

Performance, metabolic and hormonal responses of grazing Nellore cows to an energy-protein supplementation during the pre-partum phase

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Pregnancy rate is influenced by nutrition, because it directly affects the reproductive physiology in beef cows [6], mainly in periods of higher requirements like pre and postpartum. If nutrition is inadequate, body reserves become depleted and body condition declines (Diskin & Kenny 2016), resulting in low ovulation rate. Females with adequate metabolic status and high body weight have high levels of glucose, insulin and growth factor I (IGF-I) (Yelich et al 1995; Santos & Amstalden 1998), potentiating the effect of gonadotrophins (LH and FSH) (Spicer & Echternkamp 1995) and promoting ovulation (Sirois & Fortune 1988).…”

Section: Discussionmentioning

confidence: 99%

“…When growth rate decreases and the process of fat deposition begins, larger animals are still in the growth phase (Mckiernan 2005). In addition, the higher pregnancy rate observed in the taurine females can be explained by the greater selection for precocity carried out in the herds from which these females proceed (Diskin & Kenny 2016). When heifers reach puberty and mate earlier the biological efficiency of the herd is improved for as long as the early mating does not compromise full development.…”

Section: Discussionmentioning

confidence: 99%

Direct and indirect nutritional factors that determine reproductive performance of heifer and primiparous cows

Eloy

Bremm

Lobato

et al. 2020

Preprint

View full text Add to dashboard Cite

23Pregnancy rate is a major determinant of population dynamics of wild ungulates 24 and of productivity of livestock systems. Allocation of feeding resources, including 25 stocking rates, prior to and during the breeding season is a crucial determinant of this vital 26 rate. Thus, quantification of effects and interaction among multiple factors that affect 27 pregnancy rate is essential for management and conservation of pasture-based systems. 28 Pregnancy rate of 2982 heifers and primiparous cows was studied as a function of animal 29 category, average daily gain during the breeding season, stocking rate, pasture type and 30 body weight at the beginning of the breeding season. Data were obtained from 43 31 experiments conducted in commercial ranches and research stations in the Pampas region 32 between 1976 and 2015. Stocking rate ranged from 200 to 464 kg live weight/ha, which 33 brackets values for most of the grazinglands in similar regions. Age at breeding was 14-34 36 months (24.6 ± 7.5 months); initial breeding weights were 129-506 kg and 194-570 35 kg for heifers and primiparous cows. Pregnancy rate was modeled with an apriori set of 36 explanatory variables where proximate variables (breed, body weight at start of breeding, 37 weight gain during breeding and category) were included first and subsequently modeled 38 as functions of other variables (pasture type, supplementation and stocking rate). This 39 modeling approach allowed detection of direct and indirect effects (through nutrition and 40 body weight) of factors that affect pregnancy rate. Taurine (Bos taurus breeds, N = 1058) 41 had higher pregnancy rate than B. Taurus x B. indicus crossbreed (N = 1924) females.42Pregnancy rate of heifers and primiparous cows grazing in natural grasslands decreased 43 with increasing stocking rate, but no effect of stocking rate was detected in cultivated and 44 improved pastures. Pregnancy rate increased with increasing average daily gain during 45 the breeding season. Use of cultivated or improved natural pastures promotes higher 3 46 pregnancy rate, as well as allows higher in stocking rate at the regional level. Body weight 47 at the start of the breeding season is the primary determinant of pregnancy rates in heifer 48 and primiparous cows. 49 50 4 70changes in economic and technological factors that affect productivity (IBGE 2020). Low 71 pregnancy rates prevent full development of the livestock sector in many regions of the 72 world, and it may be associated with poor pasture management, overstocking and lack of 73 differential nutritional management for animal categories with different requirements. 74Stocking rate is considered the most important decision in grazing management because 75 it affects the forage base, herbage allowance, intake and animal performance 76 (Sollenberger, Agouridis, Vanzant, Franzluebbers & Owens 2012). Nutritional limitation 77 during periods of high requirement can compromise development and delay puberty of 78 heifers, as well as inhibit ovulation of cows (Rocha & Lobat...

show abstract

“…Beef cows consider a primary source of cattle for the meat industry and many problems are affecting the productivity of these cows (Diskin and Kenny, 2016). The effects of these factors on CE and SCE rates and reproductive performance were also investigated.…”

Section: Discussionmentioning

confidence: 99%

“…Extended post calving anestrus in suckled beef cows is one of the most common limitations to gaining a calf every year (Miller and Ungerfeld, 2008). Climatic stress, parity, extended suckling, nutritional deficiencies, and management practices were the most common reasons of prolonged calving intervals (Diskin and Kenny, 2016).…”

Section: Discussionmentioning

confidence: 99%

Agreement among bacteriological findings, vaginal discharges, and endometrial cytology for endometritis detection in postpartum beef cows.

Mohammed

Yimer

Haron

et al. 2017

Emir. J. Food Agric

View full text Add to dashboard Cite

Managing the reproductive performance of beef cows

Cited by 88 publications

References 36 publications

Performance, metabolic and hormonal responses of grazing Nellore cows to an energy-protein supplementation during the pre-partum phase

Performance, metabolic and hormonal responses of grazing Nellore cows to an energy-protein supplementation during the pre-partum phase

Direct and indirect nutritional factors that determine reproductive performance of heifer and primiparous cows

Agreement among bacteriological findings, vaginal discharges, and endometrial cytology for endometritis detection in postpartum beef cows.

Contact Info

Product

Resources

About