This review summarizes the status of art cow-calf relationships at birth and during lactation, including physiological mechanisms throughout suckling/nursing weaning which can impact on productive reproductive parameters, social behaviour across mother-offspring pairs, required positive welfare approach in beef cattle. The time spent close to calf after birth, latency nurse, nursing time, grooming vocalisations be considered fair proxies oxytocin release maternal care neonatal period....

Nutrition and suckling are largely recognised as the most important factors affecting postpartum period consequently reproductive efficiency of beef cattle. The aim this study was to evaluate effects body condition score (BCS) restriction with without presence calf on milk production, performance. Sixty-three crossbred (Angus × Hereford) multiparous cows were managed maintain different BCS at calving thereafter (low vs moderate; L, n = 31 M, 32). Within each group (L M) week 9 (66 ± 0.88...

Early weaning is used to advance postpartum ovulation in beef cows, but triggers a stress response, affecting cows' and calves' welfare. Our aim was compare the response early multiparous primiparous cows. Seventy-one days after birth, calves from 14 11 cows were weaned. Since cow's body weight (BW), condition (BC), milk yield BW recorded. Basophil/neutrophil relationship, total protein albumin concentrations measured before weaning. The distance between each cow its calf weaning, as well...

Family-run cow-calf farms based on native grasslands exhibit low economic and social sustainability, as reflected in family incomes high workloads. Experimental results have shown that pasture–herd interaction management could improve animal productivity. This paper analyzes the extent to which sustainability of family-run livestock be enhanced by a systemic redesign informed ecological intensification practices. The research questions address initial state farm key bottlenecks improving...

We tested the hypothesis that supplementation with cracked maize during last week of pregnancy would provide ewes a substrate for glucose and enhance synthesis lactose and, consequently, their production colostrum. Thirty single- 30 twin-bearing were fed lucerne hay half each group was supplemented daily 0.75 kg per head pregnancy. Colostrum endocrine patterns in animals investigated. Supplementation more than doubled mass colostrum available at birth unsupplemented ewes: 339 v. 145 g...

The aim was to evaluate the association between growth, carcass and visual scores traits with precocious calving in Nellore cattle. Birth weight (BW), at 120, 210, 365 450 days of age, pre post-weaning average daily gain, rib eye area, backfat thickness (BF), rump fat obtained 18 months were used for analysis. Records from 700 females born 2009 2015, exposed mating starting 11 age analyzed. Discriminant analyzes performed software Statistica. BW BF showed highest (P>0.01) discrimination...

The objective of this study was to evaluate the effects energy restriction gestation adult ewes from day 45 115 on lamb live performance parameters, carcass and meat traits. In experiment I, dietary restricted at 70% metabolizable (ME) requirements, after which were re-fed ad libitum until lambing. II, 60% ME requirements All grazed together end periods weaning. Lambs weaned lot fed slaughter. Feed intake, weight gain feed efficiency recorded, body fat thickness ribeye area (REA) measured in...

Abstract The effects of body condition score (BCS) 2·0 or 3·0 units at calving (low v. moderate), post-partum energy intake 0·6 1·0 MJ metabolizable (ME) per day kg M0·75 high) and unrestricted restricted (once daily) suckling on the ability cows to ovulate were studied in a 2 ✕ factorial design with each treatment replicated eight times. Calf isolation imposed shortly after selection first dominant follicle (DF) emerge 21 post partum. episodic release LH (sampled 15-min intervals for 10 h)...

Lupins and maize, with similar concentrations of metabolisable energy, should produce responses in colostrum production at parturition when fed during the last week pregnancy, but, present study, we tested proposal that physical form whole lupins would restrict intake and, therefore, response compared cracked or maize. Fifty-five twin-bearing ewes were divided into four groups: 15 days 14 lupins, 13 maize received no supplement. The supplements increasing amounts for 6 to avoid acidosis....

The experiment tested the hypothesis that short-term feeding of barley just before lambing would be as effective maize in stimulating early production colostrum. Both grains are high starch, and should provide a substrate for lactose which, turn, promotes lactogenesis. Thirty-five Corriedale ewes bearing single foetuses 25 twin-foetuses from synchronised mating were fed on pasture during most gestation. Fourteen days expected time single- twin-bearing allocated to three treatments (1) basal...

Objective To identify and describe the occurrence of neurological lesions that could have an effect on lamb mortality. Procedure The central nervous system was investigated macroscopically (n = 92) microscopically 72) in lambs dying perinatal period during 3 years flocks adult Corriedale ewes. removed intact samples cerebral cortex, basal ganglia, thalamus, hippocampus, mesencephalon, cerebellar medulla oblongata, cervical spinal cord were scored for severity neuronal dead, cytotoxic...

This study tested the hypothesis that ewes bearing single or twin lambs shorn at 70 120 days of pregnancy would give birth to more vigorous than those born unshorn ewes, increasing chances lamb survival. was in two experiments. In first, 57 adult Corriedale were allocated three treatments; shearing Day gestation (S70, n = 18), (S120, 19) (US, 20). second, twins same treatments: S70, 18; S120, 20; US, 19. All grazed native pasture until penned and fed individually requirements during last 10...

Summary Sixty‐four spring‐calved primiparous crossbred cows paired by calving date and body condition score (BCS) at were used to study the effect of a short‐term increase in nutritional plane before mating period on cow calf performance, changes metabolic endocrine parameters hepatic gene expression. At 48 ± 10 days post‐partum (onset treatment = day 0), assigned two treatments during 23 days: control (grazing native pastures; NP; n 31) increased (NP improved with Lotus subbiflorous cv...

Early weaning may be used in beef cattle production to improve reproduction rates range conditions. However, causes a stress response cows, which especially strong early management, as the bond between cow and calf is still strong. We hypothesized that calves two steps, with aid of anti-sucking devices (nose flaps) would reduce behavioural cows separated from their 2 months after parturition. compared behaviour frequency weight change were weaned abruptly, by separation on day 0 study, or...

The objective of the present experiment was to compare behavioural response calves reared by cows different milk yields prevention suckling with aid nose-flaps that allowed maintenance social contact dam. Twenty Hereford or × Angus crossbred primiparous from a single herd remained their until beginning experiment, in late summer–early autumn. Milk production determined monthly during lactation period and pairs were selected according cows’ production, for higher lower yield (HMY LMY,...

The objective of this experiment was to determine the differences in behavioural changes observed 6-month-old beef calves at weaning relation milk yield availability from their dams. Eighteen Hereford or × Angus crossbred primiparous cows a single herd remained with suckling until beginning (194.1 ± 1.9 days after calving). On day 0, were moved 100-m2 corral far mothers, which taken field more than 1000 m away, and returned original paddock on 1. Milk production determined monthly during...

The objective was to compare the behavioural and productive response of cows either abrupt or two-step weaning with nose flaps. Calves were fitted flaps during 14 days before separation from their dams (NF group); abruptly permanently separated (AW group), remained as non-weaned controls (NW group). behaviour recorded after nose-flap insertion permanent separation. Milk yield composition determined. After separation, milk NW greater than that NF AW cows. paced vocalised more cows, times...