scholarly journals 150 Administering an appeasing substance to Bos indicus-influenced beef cattle at weaning and feedlot entry

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 149-149
Author(s):  
Allison Millican ◽  
Reinaldo F Cooke ◽  
Alice Brandão ◽  
Thiago Schumaher ◽  
Osvaldo Souza ◽  
...  
Keyword(s):  
Body Weight ◽  
Beef Cattle ◽  
Treatment Effects ◽  
Plasma Concentrations ◽  
Bos Indicus ◽  
Feedlot Cattle ◽  
Cow Calf ◽  
Calming Effect ◽  
To Receive

Abstract Bovine appeasing substance (BAS) is expected to have calming effect in cattle experiencing stressful situations, including weaning and feedlot arrival. In Exp. 1, 186 Bos indicus-influenced calves (73 heifers, 133 bulls) were weaned at 211 ± 1 d of age (d 0). Upon weaning, calves were ranked by sex and body weight (BW), and assigned to receive BAS (Nutricorp, Araras, SP, Brazil; n = 94) or water (CON; n = 92). Treatments (5-mL) were topically applied to the forehead of each animal. Calf BW was recorded and samples of blood and tail-switch hair collected on d 0, 15, and 45. Calves that received BAS had greater (P < 0.01) average daily again (ADG) from d 0 to 15, and BW on d 15 compared with CON. Overall ADG and BW on d 45 were also greater (P < 0.05) in BAS vs. CON. Plasma concentrations of haptoglobin were less (P < 0.01) in BAS vs. CON cattle on d 15, whereas cortisol concentrations in plasma and tail-switch hair did not differ between treatments (P > 0.16). In Exp. 2, 140 B. indicus-influenced bulls (~27 mo of age) were transported from a cow-calf ranch to a commercial feedlot (d -1), and maintained on a single pasture for 24 h. On d 0, bulls were ranked by BW and assigned to receive BAS (n = 70) or CON (n = 70) as in Exp. 1. Bulls receiving BAS had greater (P = 0.04) ADG from d 0 to 15, but less (P < 0.01) ADG from d 15 to 45 compared to CON. No other treatment effects were detected (P > 0.18). Therefore, BAS administration to beef cattle at weaning or feedlot entry had immediate benefits to ADG, which were sustained for 45 d in weaned calves but not in feedlot cattle.

scholarly journals 118 Administering a synthetic appeasing pheromone to Bos indicus-influenced beef cattle at weaning and feedlot entry

2019 ◽  
Vol 97 (Supplement_1) ◽  
pp. 52-53
Author(s):  
Alice Brandão ◽  
Reinaldo F Cooke ◽  
Kelsey Schubach ◽  
Thiago Schumaher ◽  
Osvaldo Souza ◽  
...  
Keyword(s):  
Body Weight ◽  
Beef Cattle ◽  
Treatment Effects ◽  
Bos Indicus ◽  
Feedlot Cattle ◽  
Cow Calf ◽  
Calming Effect ◽  
To Receive

Abstract Synthetic appeasing pheromone (SAP) is expected to have a calming effect in cattle experiencing stressful situations, including weaning and feedlot arrival. In Exp. 1, 186 Bos indicus-influenced calves (73 heifers, 133 bulls) were weaned at 211 ± 1 d of age (d 0). Upon weaning, calves were ranked by sex and body weight (BW), and assigned to receive SAP (Nutricorp, Araras, SP, Brazil; n = 94) or water (CON; n = 92). Treatments (5 mL) were topically applied to the forehead of each animal. Calf BW was recorded on d 15 and 45. Calves that received SAP had greater (P < 0.01) average daily again (ADG) from d 0 to 15, and BW on d 15 compared with CON (0.94 vs. 0.73 kg/d and 249 vs. 246 kg; respectively). Calf ADG from d 15 to 45 was similar (P = 0.97) between treatments. Overall ADG and BW on d 45 were also greater in SAP vs. CON (0.36 vs. 0.29 kg/d and 251 vs. 248 kg; respectively). In Exp. 2, 140 Bos indicus-influenced bulls (~27 mo of age) were transported from a cow-calf ranch to a commercial feedlot (d -1), and maintained on a single pasture for 24 h. On d 0, bulls were ranked by BW and assigned to receive SAP (n = 70) or CON (n = 70) as in Exp. 1. Bulls receiving SAP had greater (P = 0.04) ADG from d 0 to 15, but less (P <0.01) ADG from d 15 to 45 compared to CON (1.65 vs. 1.45 kg/d and 1.42 vs. 1.65 kg/d; respectively). No other treatment effects were detected (P ≥ 0.18). Therefore, SAP administration to beef cattle at weaning or feedlot entry had immediate benefits to ADG, which were sustained for 45 d in weaned calves but not in feedlot cattle

8 Effects of a Bovine Appeasing Substance Application at Weaning on Temperament and Growth of Bos Indicus Influenced Heifers

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 3-4
Author(s):  
Douglas G Viera ◽  
Juliana Ranches ◽  
Marcelo Vedovatto ◽  
Giovana G Pirota ◽  
Bruno I Cappellozza ◽  
...  
Keyword(s):  
Body Weight ◽  
Single Dose ◽  
Beef Cattle ◽  
Average Daily Gain ◽  
Bos Indicus ◽  
Cattle Herd ◽  
Synthetic Analogue ◽  
Skin Area ◽  
To Receive ◽  
Daily Gain

Abstract The objective of this study was to evaluate the effects of a synthetic analogue of the bovine appeasing pheromone (i.e. bovine appeasing substance; BAS) on growth and temperament of heifers. At weaning (d 0), 30 heifers (Aberdeen Angus ′ Nelore; 8 ± 1 mo) were stratified by body weight (199.8 ± 16 kg) and randomly assigned to receive a single dose of BAS (n = 15; SecureCattle; Nutricorp, Araras, SP, Brazil) or saline (CON; n = 15; saline 0.9% NaCl). Treatments (5 ml) were topically applied to the nuchal skin area of each animal on d0. Body weight was collected on d 0, 6, 15, 45, and 150. Chute score (1 to 5; 1 = calm, no movement; 5 = violent and continuous struggling) and chute entrance and exit score (1 to 3; 1 = slow; 3 = fast) were collected on d 0, 2, 6, 15, 45 and 150. Scores were averaged across 4 trained technicians. Data were analyzed using the MIXED procedure of SAS. Heifers assigned to BAS had greater (P &lt; 0.01) average daily gain (ADG) than heifers assigned to CON treatment from d 6 to 15 (2.35 and 1.88 kg/d ± 0.16) and from d 15 to 45 (1.79 vs. 1.56 kg/d ± 0.08). Heifers assigned to BAS had lower (P &lt; 0.01) chute entrance score on d 6, 15, and 45, and chute exit score on d 2 to 45 (P = 0.05) when compared to heifers assigned to CON. Additionally, heifers assigned to BAS tended (P = 0.08) to have lower chute score, from d 1 to 150 than heifers assigned to CON. The application of BAS at weaning improved heifers ADG, likely due to an improvement in temperament, suggesting that BAS application has calming effects in the beef cattle herd.

scholarly journals PSVII-14 Performance and health responses of feedlot cattle consuming different feed additives during a 45-day receiving period

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 295-296
Author(s):  
Eduardo Colombo ◽  
Reinaldo F Cooke ◽  
Alice Brandão ◽  
Jacob Wiegand ◽  
Kelsey Schubach ◽  
...  
Keyword(s):  
Body Weight ◽  
Respiratory Disease ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Treatment Effects ◽  
Animal Health ◽  
Feedlot Cattle ◽  
Feed Additives ◽  
Total Incidence ◽  
To Receive

Abstract This experiment compared performance and health responses of feedlot cattle consuming different feed additives during a 45-d receiving period. Angus-influenced steers (n = 256) were purchased from a commercial auction yard, and road-transported (12 h) to the experimental feedyard on d -1. Upon arrival, body weight (BW) was recorded and steers were ranked by BW into 1 or 18 drylot pens (14 or 15 steers/pen). Pens were randomly assigned to receive RAMP® from d 0 to d 45 with the inclusion of: 1) Rumensin + Tylan (Elanco Animal Health; Greenfield, IN; 360 mg and 90 mg per animal/daily, respectively; RT), 2) Rumensin + Celmanax + Certillus (Church and Dwight Co., Inc., Princeton, NJ; 18 g and 28 per animal/daily, respectively; RCC), or Celmanax + Certillus (18 g and 28 per animal/daily, respectively; CC). Feed intake during the initial 21 d of the experiment was greater (P ≤ 0.05) in CC vs. RCC and RT. No treatment effects were detected for steer BW gain and feed efficiency (P ≥ 0.41). Total incidence of steers treated for respiratory disease did not differ between treatments (77.9, 82.3, and 80.0%, respectively, P = 0.77). Removal of steers from the experiment due to extreme morbidity of mortality was greater (P = 0.02) in RT vs. CC, and intermediate for RCC (22.4, 7.0, and 12.9%, respectively). Accordingly, total liveweight per pen on d 45 was greater (P ≤ 0.05) for CC and RCC vs. RT (3.79, 3.61, and 3.20 ton, respectively). Inclusion of CC into a receiving diet improved initial feed intake compared with ionophore-containing diets, but without changing steer performance. Moreover, CC and RCC resulted in improved health responses during the 45-d receiving period compared with the traditional RT receiving diet. These results suggest that CC ingredients improved intake and immunocompetence of receiving cattle.

scholarly journals 268 Administering an appeasing substance to optimize welfare and performance of receiving cattle

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 193-193
Author(s):  
Eduardo Colombo ◽  
Reinaldo F Cooke ◽  
Alice Brandão ◽  
Jacob Wiegand ◽  
Kelsey Schubach ◽  
...  
Keyword(s):  
Feed Intake ◽  
Feed Efficiency ◽  
Treatment Effects ◽  
Average Daily Gain ◽  
Plasma Concentrations ◽  
Feedlot Cattle ◽  
Skin Area ◽  
And Performance ◽  
Antimicrobial Treatments ◽  
Daily Gain

Abstract This experiment evaluated the impacts of bovine appeasing substance (BAS) administration on performance, health, and physiological responses of feedlot cattle during a 45-d receiving period. A total of 342 recently-weaned Angus-influenced steers, originating from 16 cow-calf operations, were obtained from an auction yard on d -1 and road-transported (12 h) to the feedlot. Upon arrival on d 0, body weight (BW) was recorded and steers were ranked by BW and source and assigned to receive BAS (Nutricorp, Araras, SP, Brazil; n = 171) or placebo (diethylene glycol monoethyl ether; CON; n = 171). Treatments (5 mL) were topically applied to the nuchal skin area of each animal. Within treatment, calves were allocated to 1 of 24 drylot pens (12 pens/treatment) and received a free choice total-mixed ration from d 1 to 45. Calves were assessed for bovine respiratory disease (BRD) signs and feed intake was recorded from each pen daily. Steer BW was again recorded on d 1, 7, 17, 31, and 45, whereas blood samples were collected from 5 steers/pen concurrently with each BW assessment. Average daily gain was greater (P = 0.05) in BAS vs. CON calves, although final BW did not differ (P = 0.36) between treatments. No treatment effects were detected for feed intake (P = 0.95), resulting in greater (P = 0.05) feed efficiency in BAS vs. CON steers. No treatment effects were detected (P ≥ 0.37) for plasma concentrations of haptoglobin, whereas plasma cortisol concentrations were greater (P = 0.05) in CON vs. BAS steers on d 7 (treatment × day; P = 0.07). Incidence of BRD was greater (P ≤ 0.05) in BAS vs. CON on d 6 to 10 and d 18 to 21 (treatment × day; P &lt; 0.01), although overall BRD incidence did not differ (P = 0.24) between treatments. The number of antimicrobial treatments required per steer diagnosed with BRD symptoms to recover from sickness was greater (P = 0.04) in CON vs. BAS calves. No treatment differences were detected (P ≥ 0.41) for mortality incidence, or proportion of steers removed from the experiment due to extreme sickness. Results from this experiment indicate BAS administration upon feedlot entry improved average daily gain by enhancing feed efficiency. Administration of BAS facilitated earlier detection of BRD and reduced the need for antimicrobial treatments. Collectively, these results suggest BAS administration as a promising strategy to benefit performance and immunocompetence of feedlot receiving cattle.

Strategic administration of an appeasing substance to improve performance and physiological responses of Bos indicus feedlot cattle

2021 ◽  
Author(s):  
Vitor G L Fonseca ◽  
Bruno I Cappellozza ◽  
Osvaldo A de Sousa ◽  
Manuella Sagawa ◽  
Bruna Rett ◽  
...  
Keyword(s):  
Serum Insulin ◽  
Physiological Responses ◽  
Bos Indicus ◽  
Serum Cortisol ◽  
Serum Glucose ◽  
Feedlot Cattle ◽  
Skin Area ◽  
Feeding Period ◽  
Treatment Administration ◽  
To Receive

Abstract This study was designed to evaluate the timing of administration of the bovine appeasing substance (BAS) on performance and physiological responses of Bos indicus feedlot cattle. Nellore bulls (n = 100) were ranked by initial body weight (BW; 341 ± 18.5 kg) and assigned to receive BAS (n = 50) or placebo (CON; n = 50) on d -2 of the experiment. Treatments (5 mL) were applied topically to the nuchal skin area of each bull. Bulls were loaded into commercial livestock trailers immediately after treatment administration, transported for 880 km, and unloaded on d -1 at a commercial feedyard. On d 0, bulls within each treatment were again assigned to receive, in a 2 x 2 factorial arrangement, BAS or CON as previously described (25 bulls/treatment combination). Upon treatment administration on d 0, bulls were housed in 12 feedlot pens (3 pens/treatment) for a 108-d feeding period, which was divided into an adaptation (d 0 – 19), growing (d 20 – 60), and finishing (d 61 – 108) phases. Dry matter intake (DMI) was measured daily from d 0 to 108, whereas blood samples and hair from the tail switch were collected on d -2, 0, 19, 60, and 108. Administration of BAS prior to loading (d -2) improved ADG, FE, and DMI during adaptation and across the 108-d feeding period (P ≤ 0.08), resulting in greater (P = 0.03) hot carcass weight and dressing percentage upon slaughter on d 109. A treatment × day interaction was detected for serum glucose concentrations (P = 0.05), which was greater (P = 0.03) on d 60 of the feeding period in bulls receiving CON prior to loading. Administration of BAS at feedlot entry (d 0) improved DMI, ADG, and FE during adaptation (P ≤ 0.05), but it did not impact (P ≥ 0.18) performance and carcass traits during the 108-d feeding period. Bulls administered BAS prior to loading and at feedlot entry had less (P ≤ 0.05) mean serum cortisol concentrations across the 108-d feeding period (loading × feedlot entry interaction; P = 0.10), and greater (P ≤ 0.05) serum insulin concentration on d 60 (loading × feedlot entry × day interaction; P = 0.05). In summary, BAS administration prior to loading increased overall feedlot performance of Nellore bulls. These outcomes were noted in bulls that received or not a second BAS administration at feedlot entry, suggesting that the benefits of BAS are exploited when this substance is administered before transport to the feedlot.

scholarly journals Supplementing organic-complexed or inorganic Co, Cu, Mn, and Zn to beef cows during gestation: physiological and productive response of cows and their offspring until weaning

2021 ◽  
Author(s):  
Kelsey M Harvey ◽  
Reinaldo F Cooke ◽  
Eduardo A Colombo ◽  
Bruna Rett ◽  
Osvaldo A de Sousa ◽  
...  
Keyword(s):  
Mrna Expression ◽  
Milk Production ◽  
Treatment Effects ◽  
Muscle Development ◽  
Bos Taurus ◽  
Body Condition Score ◽  
Bos Indicus ◽  
Beef Cows ◽  
Condition Score ◽  
To Receive

Abstract One hundred and ninety non-lactating, pregnant beef cows (¾ Bos taurus and ¼ Bos indicus; 138 multiparous and 52 primiparous) were assigned to this experiment at 117 ± 2.2 d of gestation (d 0). Cows were ranked by parity, pregnancy type (artificial insemination = 102, natural service = 88), body weight (BW) and body condition score (BCS), and assigned to receive a supplement containing: 1) sulfate sources of Cu, Co, Mn, and Zn (INR; n = 95) or 2) an organic complexed source of Cu, Mn, Co, and Zn (AAC; Availa®4; Zinpro Corporation, Eden Prairie, MN; n = 95). The INR and AAC provided the same daily amount of Cu, Co, Mn, and Zn, based on 7 g of the AAC source. From d 0 to calving, cows were maintained in a single pasture and were segregated three times weekly into 1 of 24 individual feeding pens to receive treatments. Cow BW and BCS were recorded on d -30, d 97, upon calving, and at weaning (d 367). Milk production was estimated at 42 ± 0.5 d postpartum via weigh-suckle-weigh (WSW). Liver biopsies were performed in 30 cows/treatment on d -30, 97, upon calving, and the day after WSW. Calf BW was recorded at birth and weaning. Liver and longissimus muscle (LM) biopsies were performed in 30 calves/treatment upon calving and 24 h later, the day after WSW, and at weaning. No treatment effects were detected (P ≥ 0.49) for cow BCS during gestation, despite AAC cows having greater (P = 0.04) BW on d 97. Liver Co concentrations were greater (P &lt; 0.01) for AAC compared to INR cows, and liver concentrations of Cu were greater (P = 0.02) for INR compared to AAC cows on d 97. Upon calving, INR cows had greater (P ≤ 0.01) liver Cu and Zn concentrations compared to AAC cows. No other treatment differences were noted (P ≥ 0.17) for cow and calf liver trace mineral concentrations. Cows receiving AAC had greater (P = 0.04) hepatic mRNA expression of metallothionein 1A at calving, and their calves had greater (P = 0.04) hepatic mRNA expression of superoxide dismutase at weaning. Milk production did not differ between AAC and INR cows (P = 0.70). No treatment effects were detected (P ≥ 0.29) for mRNA expression of LM genes associated with adipogenic or muscle development activities in calves at birth and weaning. Calf birth and weaning BW also did not differ (P ≥ 0.19) between treatments. In summary, supplementing Co, Cu, Zn, and Mn as organic complexed or sulfate sources to beef cows during the last 5 mo of gestation yielded similar cow-calf productive responses until weaning.

INFLUENCE OF AGE, WEIGHT AND GROWTH RATE ON BASAL LH, GROWTH HORMONE AND CORTISOL, AND ESTROGEN-INDUCED LH RELEASE IN PREPUBERTAL GILTS

1987 ◽  
Vol 67 (4) ◽  
pp. 1001-1010 ◽  
Author(s):  
R. N. KIRKWOOD ◽  
F. D. EVANS ◽  
F. X. AHERNE
Keyword(s):  
Growth Hormone ◽  
Body Weight ◽  
Treatment Effects ◽  
Plasma Concentrations ◽  
Pulse Amplitude ◽  
Estradiol Benzoate ◽  
Early Morning ◽  
Blood Samples ◽  
Lh Release

Thirty-six Yorkshire × Landrace gilts were selected at 74 d of age and 32 kg body weight and assigned equally to one of six treatments. The first three treatments involved feeding gilts to achieve weights of 90 kg at 175 d, 90 kg at 195 d, or 70 kg at 175 d (treatments 1, 2 and 3, respectively). A further three groups of gilts were fed to achieve the same weights (90, 90 or 70 kg) 20 d younger than those above. Upon the achievement of their final weight the latter three groups of gilts were subjected to a feed restriction in order to achieve a zero net weight for 20 d until they achieved the required age (treatments 4, 5 and 6). At the achievement of the specified age-weight end point blood samples were taken from all gilts at 2-h intervals for 24 h (2400–2200 h) for the determination of plasma concentrations of luteinizing hormone (LH), growth hormone (GH) and Cortisol. Additionally, during a 4-h period on the same day (0800–1200 h) all gilts were sampled at 15-min intervals for determination of pulsatile LH secretion. Following the initial 24-h sampling, all gilts received an intramuscular injection of estradiol benzoate (EB; 15 μg kg−1 body weight) and blood samples were collected at 6-h intervals for 72 h for determination of plasma LH. No treatment effects were noted on the mean daily plasma levels of cortisol, LH or GH. Plasma concentrations of cortisol tended to decrease with increasing age or weight, but these differences were not significant. Significant elevations of plasma GH occurred in the early morning and evening, but rarely between 0400 and 1600 h. A similar nycterohemeral rhythm was noted for plasma LH levels. There were no treatment effects on LH pulse frequency but LH pulse amplitude was greater at a given age (P < 0.07), in the heavier gilts (treatments 1 and 4 vs. 3 and 6). There was no effect of treatment on the LH response to EB injection, although two patterns of LH release were observed, involving either a single or a double peak of LH. Key words: Gilts, age, weight, puberty

PSXIII-16 Supplementing organic-complexed or inorganic Co, Cu, Mn, and Zn to beef cows during gestation: physiological and productive responses of cows and their offspring until weaning

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 432-433
Author(s):  
Kelsey Harvey ◽  
Reinaldo F Cooke ◽  
Eduardo Colombo ◽  
Bruna Rett ◽  
Osvaldo Sousa ◽  
...  
Keyword(s):  
Superoxide Dismutase ◽  
Mrna Expression ◽  
Milk Production ◽  
Treatment Effects ◽  
Beef Cows ◽  
Longissimus Muscle ◽  
Liver Biopsies ◽  
Cow Calf ◽  
To Receive ◽  
Cu And Zn

Abstract Pregnant, non-lactating beef cows (n = 190; 117 ± 2.2 d of gestation; d 0) were assigned to receive: 1) sulfate sources of Cu, Co, Mn, and Zn (INR; n = 95) or 2) an organic complexed source of Cu, Mn, Co, and Zn (AAC; Availa®4, Zinpro; n = 95). From d 0 to calving, cows were maintained in a single pasture and individually offered treatments three times weekly. Cow BW and BCS were recorded on d -30, d 97, upon calving, and at weaning and liver biopsies performed in 30 cows/treatment. Milk production was estimated at 42 ± 0.5 d postpartum via weigh-suckle-weigh (WSW). Liver and longissimus muscle (LM) biopsies were performed in 30 calves/treatment upon calving and 24 h later, at WSW, and at weaning. No treatment effects were detected (P ≥ 0.49) for cow BCS, despite AAC cows having greater (P = 0.04) BW on d 97. Liver Co (P &lt; 0.01) concentrations were greater for AAC compared to INR cows, and liver concentrations of Cu were greater (P = 0.02) for INR compared to AAC cows on d 97. Upon calving, INR cows had greater (P ≤ 0.01) liver Cu and Zn concentrations compared to AAC cows. Cows receiving AAC had greater (P = 0.04) hepatic mRNA expression of metallothionein 1A at calving, and their calves had greater (P = 0.04) hepatic mRNA expression of superoxide dismutase at weaning. Milk production did not differ between AAC and INR cows (P = 0.70). No treatment effects were detected (P ≥ 0.29) for mRNA expression of LM genes in calves at birth and weaning. Calf birth and weaning BW were similar (P ≥ 0.19) between treatments. Hence, supplementing AAC or INR to beef cows during the last 5 mo of gestation yielded similar cow-calf productive responses until weaning.

scholarly journals Treatments to Optimize the Use of Artificial Insemination and Reproductive Efficiency in Beef Cattle under Tropical Environments

2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
Ocilon Gomes de Sá Filho ◽  
José Luiz Moraes Vasconcelos
Keyword(s):  
Body Weight ◽  
Beef Cattle ◽  
Artificial Insemination ◽  
Bos Taurus ◽  
Bos Indicus ◽  
Reproductive Efficiency ◽  
Tropical Environments ◽  
Final Maturation ◽  
Tropical Areas ◽  
Tropical Climates

Bos indicuscattle, the preferred genetic group in tropical climates, are characterized by having a lower reproductive efficiency thanBos taurus. The reasons for the poorer reproductive efficiency of theBos indicuscows include longer lengths of gestation and postpartum anestrus, a short length of estrous behavior with a high incidence of estrus occurring during the dark hours, and puberty at older age and at a higher percentage of body weight relative to mature body weight. Moreover, geography, environment, economics, and social traditions are factors contributing for a lower use of reproductive biotechnologies in tropical environments. Hormonal protocols have been developed to resolve some of the reproductive challenges of theBos indicuscattle and allow artificial insemination, which is the main strategy to hasten genetic improvement in commercial beef ranches. Most of these treatments use exogenous sources of progesterone associated with strategies to improve the final maturation of the dominant follicle, such as temporary weaning and exogenous gonadotropins. These treatments have caused large impacts on reproductive performance of beef cattle reared under tropical areas.

PSX-B-17 Appeasing substance application at weaning enhanced growth and temperament of bos indicus-influenced weaned calves in grazing system

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 220-220
Author(s):  
Douglas G Viera ◽  
Juliana Ranches ◽  
Bruno I Cappellozza ◽  
Henrique J Fernandes ◽  
Marcella D’Oliveira ◽  
...  
Keyword(s):  
Body Weight ◽  
Single Dose ◽  
Average Daily Gain ◽  
Bos Indicus ◽  
Synthetic Analogue ◽  
Skin Area ◽  
Grazing System ◽  
Urochloa Brizantha ◽  
To Receive ◽  
Daily Gain

Abstract The objective of this study was to evaluate the effects of a synthetic analogue of the bovine appeasing pheromone (i.e. bovine appeasing substance; BAS) on growth and temperament of weaned calves grazing Capim-Marandú (Urochloa brizantha cv Marandú). At weaning (d 0), 86 calves (47 steers and 39 heifers; Aberdeen Angus ′ Nelore; 8 ± 1 mo) were stratified by body weight (197.9 ± 24.9 kg) and randomly assigned to receive a single dose of BAS (n = 43; SecureCattle; Nutricorp, Araras, SP, Brazil) or saline (CON; n = 43; saline 0.9% NaCl). Treatments (5 ml) were topically applied to the nuchal skin area of each animal on d0. Body weight was collected on d 0, 8, 15, 51 and 100. Chute score (1 to 5; 1 = calm, no movement; 5 = violent and continuous struggling) and chute entrance and exit scores (1 to 3; 1 = slow; 3 = fast) were collected on d 3, 8, 15, 51 and 100. Scores were averaged across 3 trained technicians. Data were analyzed using the MIXED procedure of SAS. Calves assigned to BAS treatment had greater (P &lt; 0.01) average daily gain (ADG) from d 8 to 15 (0.158 and -0.284 kg/d ± 0.07). Calves assigned to BAS treatment tended (P = 0.10) to have lower chute entrance score on d 8 and 51 and had lower (P = 0.02) chute exit score on d 8 than calves assigned to CON treatment. Additionally, calves assigned to BAS treatment tended (P = 0.07) to have lower chute score on d 8 when compared to calves assigned to CON treatment. The application of BAS at weaning improved calf ADG and improved calf temperament as observed by chute score and chute entrance and exit scores, suggesting that BAS application has calming effects.

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