An evaluation of cattle types for north-western Australia

1993 ◽  
Vol 33 (6) ◽  
pp. 677 ◽  
Author(s):  
D Pratchett ◽  
J Wallace ◽  
S Young
Keyword(s):  
Western Australia ◽  
Growth Rates ◽  
Carcass Weight ◽  
Dry Period ◽  
Weaning Weight ◽  
Calf Growth ◽  
Calf Survival ◽  
Calving Rate ◽  
North Western

An evaluation of calving rate and cow mortality in the Kimberley region of Western Australia was made for 6 breeder groups: Shorthorn, Brahman, F1 Brahman x Shorthorn (F1BS), F1 Africander x Shorthorn (F1AS), F, Brahman x Shorthorn (F2BS), and F2 Africander x shorthorn (F2AS). From these 6 breeder groups, 8 steer lines were produced: Shorthorn, Brahman, F1BS, F2BS, F3BS, F1AS, F2AS, and F3AS. These were evaluated for calf survival, calf growth, steer mortality, steer growth, and steer carcass weight. There were significant (P<0.001) year and breed effects on calving rate. F1BS and F1AS showed the highest calving percentage, with corrected means of 60 and 61% for the whole herd and 67 and 66% when 15-month-old heifers were excluded. The calving rate in F2BS dropped to 49%, while that in F2AS was maintained at 67%. Few cows died in any group and it was not possible to detect differences between breed types. Likewise, few steers died after 12 months of age. The lowest mean weaning weight of 116 kg in July at 6 months of age was recorded for Shorthorn calves; the highest was recorded for F2BS at 174 kg. However, the advantage was not maintained until November when the calves were 10 months old. Brahman and F1BS had superior growth rates from weaning to 10 months. There were significant (P<0.001) breed and year effects on steer liveweight at all weighing dates. After the first November weighing, Brahman and F1BS made the greatest liveweight gain. All breeds lost weight in the second dry period. At 27 and 39 months, F1BS steers had the heaviest carcass weights of 222 and 300 kg. F2AS and F3BS steers had the lowest carcass weights at both times (174 kg at 27 months and 22 kg at 39 months).

First calving performance of beef cattle. 1. Effects of moderate and slow growth between weaning and joining at 15 months of age

1985 ◽  
Vol 25 (2) ◽  
pp. 270
Author(s):  
DJ Barker ◽  
PJ May ◽  
CA Morris ◽  
PER Ridley
Keyword(s):  
Slow Growth ◽  
High Fertility ◽  
Mediterranean Environment ◽  
Weaning Weight ◽  
Calf Growth ◽  
Target Weight ◽  
The Mean ◽  
Calving Rate ◽  
Improved Pasture ◽  
Calving Performance

In each of 4 years, Shorthorn and Dairy x Shorthorn heifers were fed for moderate (55 to 101 kg) or slow (1 7 to 50 kg) growth from weaning at 7 months until joining at 15 months of age. Thereafter they grazed together on improved pasture in a 430 mm rainfall Mediterranean environment. Their performance was compared until their second calving and their calves' performance until weaning. The heifers that had grown moderately prior to their first joining had 25 to 73 kg higher average liveweight and 3 to 7 mm higher ultrasonic backfat reading during first joining, a 9% higher calving rate, 14 kg higher average liveweight but a 10% lower dystokia rate at calving, and 12 kg higher average liveweight and 1 mm higher ultrasonic backfat reading at their second joining, than those that had grown slowly. Survival of dams and calves, date of first calving, calf birth weight, second calving rate, intercalving interval and date of second calving were not significantly affected by the rate of growth prior to first joining. The effect upon dams' weight at weaning (moderate 11 kg higher than slow) was significant only at P< 0.1. Most aspects of performance differed widely amongst years, but significant year x growth interactions were only found for liveweight and condition of heifers at first joining, and for weaning weight of calf. The calves of moderately-grown heifers were of significantly lower mean weaning weight than those of the slowly-grown heifers, but only in those years when the mean mid-joining weight of the moderately grown heifers exceeded 315 kg. It is suggested that high fertility and satisfactory first calf growth are not incompatible provided that growth between the heifers' weaning and first joining is limited to that which results in a mean mid-joining liveweight not more than 20 kg higher than the target weight for 90% calving.

The effects of liveweight at weaning, date of weaning and winter nutrition on the subsequent performance of red deer

1986 ◽  
Vol 1986 ◽  
pp. 140-140
Author(s):  
J A Milne ◽  
Angela M Sibbald
Keyword(s):  
Birth Weight ◽  
Growth Rates ◽  
Red Deer ◽  
Live Weight ◽  
Meat Production ◽  
Weaning Weight ◽  
Calf Growth ◽  
Subsequent Performance ◽  
Number Of Factors

A desirable liveweight for red deer at 15 months of age is approximately 80 kg. This will provide a saleable carcase and a liveweight at which yearling hinds will successfully breed. Live-weight at 15 months will be influenced by a large number of factors including date of birth, birth-weight, liveweight gain to weaning, date of weaning, liveweight gain during the first winter and subsequent summer, and the interactions between weaning weight and subsequent levels of nutrition and between winter levels of nutrition and liveweight gain at pasture in the following summer. These latter two aspects were examined in two experiments and the effect of date of weaning on contemporary calf growth rates and on hind calving date in the following year were studied in a third experiment. The objective was to provide information which would allow the development of effective systems of deer meat production based on slaughter at 15 months of age.

scholarly journals Effect of Age at Castration on Beef Calf Performance

EDIS ◽  
2013 ◽  
Vol 2013 (3) ◽  
Author(s):  
Amie Imler ◽  
Todd Thrift ◽  
Matt Hersom ◽  
Joel Yelich
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Weaning Weight ◽  
Calf Growth ◽  
Treatment Groups ◽  
Fact Sheet ◽  
Calf Performance ◽  
Animal Sciences ◽  
Effect Of Age

A study in Florida was conducted to examine the issue of age at castration to determine if castration timing resulted in significant differences in growth rate and weaning weight in nursing calves. In addition, the study included a comparison between Angus and Brangus calves in the treatment groups to determine if there was a breed by castration effect. No differences in calf growth rates were observed in early compared to late castration. This 4-page fact sheet was written by Amie Imler, Todd Thrift, Matt Hersom, and Joel Yelich, and published by the UF Department of Animal Sciences, March 2013. http://edis.ifas.ufl.edu/an289

Maternal body size and condition determine calf growth rates in southern right whales

2018 ◽  
Vol 592 ◽  
pp. 267-281 ◽  
Author(s):  
F Christiansen ◽  
F Vivier ◽  
C Charlton ◽  
R Ward ◽  
A Amerson ◽  
...  
Keyword(s):  
Body Size ◽  
Growth Rates ◽  
Maternal Body ◽  
Calf Growth ◽  
Right Whales ◽  
Southern Right Whales

scholarly journals Large‐scale eDNA metabarcoding survey reveals marine biogeographic break and transitions over tropical north‐western Australia

2021 ◽  
Author(s):  
Katrina West ◽  
Michael J. Travers ◽  
Michael Stat ◽  
Euan S. Harvey ◽  
Zoe T. Richards ◽  
...  
Keyword(s):  
Western Australia ◽  
Large Scale ◽  
North Western

scholarly journals Sapling and coppice biomass heritabilities and potential gains from Eucalyptus polybractea progeny trials

2021 ◽  
Vol 17 (2) ◽  
Author(s):  
Beren Spencer ◽  
Richard Mazanec ◽  
Mark Gibberd ◽  
Ayalsew Zerihun
Keyword(s):  
Western Australia ◽  
Growth Rates ◽  
Genetic Parameters ◽  
Genetic Variance ◽  
Additive Genetic Variance ◽  
Short Rotation ◽  
Sapling Growth ◽  
Genetic And Phenotypic Correlations ◽  
Breeding Selections ◽  
Cross Site

AbstractEucalyptus polybractea has been planted as a short-rotation coppice crop for bioenergy in Western Australia. Historical breeding selections were based on sapling biomass and despite a long history as a coppice crop, the genetic parameters of coppicing are unknown. Here, we assessed sapling biomass at ages 3 and 6 from three progeny trials across southern Australia. After the second sapling assessment, all trees were harvested. Coppice biomass was assessed 3.5 years later. Mortality following harvest was between 1 and 2%. Additive genetic variance for the 6-sapling estimate at one site was not significant. Sapling heritabilities were between 0.06 and 0.36 at 3 years, and 0.18 and 0.20 at 6 years. The heritability for the coppice biomass was between 0.07 and 0.17. Within-site genetic and phenotypic correlations were strong between all biomass assessments. Cross-site correlations were not different from unity. Selections based on net breeding values revealed positive gains in sapling and coppice biomass. Lower or negative gains were estimated if 3-year sapling selections were applied to the coppice assessments (−7.1% to 3.4%) with useful families culled. Positive gains were obtained if 6-year sapling selections were applied to the coppice assessment (6.4% to 9.3%) but these were lower than those obtained by applying coppice selections to the coppice assessment (8.4% to 14.8%). Removal of poor performing families and families that displayed fast sapling growth rates but under-performed as coppice will benefit potential coppice production. These results indicate that selections should be made using coppice data.

Examining the impacts of red deer hind body condition score and pasture forage mass on calf weaning weight

2017 ◽  
Vol 57 (3) ◽  
pp. 466 ◽  
Author(s):  
D. R. Stevens ◽  
B. R. Thompson ◽  
G. W. Asher ◽  
I. C. Scott
Keyword(s):  
Body Condition ◽  
Cervus Elaphus ◽  
Red Deer ◽  
Body Condition Score ◽  
Restricted Feeding ◽  
Weaning Weight ◽  
Calf Growth ◽  
Total Milk ◽  
Condition Score ◽  
Average Body

The effect of pre-calving hind body condition and the interaction with pasture forage mass during lactation on calf growth and intake to weaning were investigated. Two-hundred and forty red deer hinds (Cervus elaphus scoticus × hippelaphus) of average body condition score (BCS) 3.5 were subjected to either ad libitum or restricted feeding for the 4 weeks before the expected start of calving (31 October) to create hinds of low (2.5) or high (3.5) BCS. The hinds were then grazed continuously on pasture of either low (<1200 kg DM/ha) or high (>2400 kg DM/ha) forage mass during lactation (29 October–25 March). In a 2 × 2 crossover design liveweight, liveweight gain and pasture intake were measured in both hinds and calves. Low hind body condition score (BCS 2.5) at the onset of lactation resulted in low calf weaning weight (46.9 kg) when forage mass was low, but not when forage mass was high (57.3 kg). High BCS (3.5) in hinds resulted in intermediate calf weaning weight when on low forage mass (51.2 kg) and high calf weaning weight when forage mass was high (56.6 kg). Both BCS and forage mass influenced calculated total milk production.

scholarly journals PSIII-8 Impact of SYNOVEX® ONE GRASS implantation during suckling on pre-weaning calf growth performance

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 239-239
Author(s):  
Shane Newton ◽  
Payton Dahmer ◽  
Larry Corah ◽  
Keith Harmoney ◽  
John Jaeger ◽  
...  
Keyword(s):  
Growth Performance ◽  
Random Effect ◽  
Cost Effective ◽  
Recent Decade ◽  
Estradiol Benzoate ◽  
Beef Steers ◽  
Weaning Weight ◽  
Trenbolone Acetate ◽  
Calf Growth ◽  
Randomized Design

Abstract Historic data supports the use of pre-weaning implants to maximize beef calf weaning weight, but their use has declined over the recent decade. A total of 96 beef steers (initially 85.2 kg BW and &gt; 45 d of age) were used in a 168-d study to evaluate the effects of Synovex C® implantation during suckling on pre-weaning calf growth performance. At initial processing, calves were individually weighed and allotted in a completely randomized design to one of two treatments: 1) not implanted (control) or 2) implanted with 150 mg of trenbolone acetate and 21 mg of estradiol benzoate (SYNOVEX® ONE GRASS, Zoetis, Kalamazoo, MI). All calves were weighed on d 0 (implantation), 83, 126 and 168 (weaning), with ADG calculated for each period. Data were analyzed using the GLIMMIX procedure of SAS (v9.4, Cary, NC). There were 48 replicates per treatment, with grazing location as a random effect. While there were no detected differences in BW during the initial phases (P &gt; 0.10), implanted calves tended to have greater (P = 0.100) greater weaning weight than non-implanted calves (279 vs. 265 kg, respectively). Calves implanted with SYNOVEX® ONE GRASS had 0.8, 0.12, and 0.16 kg/d greater (P &lt; 0.05) ADG than those that were not implanted in all three phases. This resulted in an average of 0.10 kg/d greater (P = 0.002) ADG in implanted calves overall compared to the control. In conclusion, this research showed significant increases in suckling calf ADG in implanted calves compared to their non-implanted counterparts, which led to a tendency for 14-kg greater weaning weights. Additional research is warranted to consider the post-weaning growth and impact of re-implanting, but this data reinforces previous literature that suckling calf implantation continues to be cost effective for cow-calf producers.

Outbreak densities of the coral predator Drupella in relation to in situ Acropora growth rates on Ningaloo Reef, Western Australia

Coral Reefs ◽  
2018 ◽  
Vol 37 (4) ◽  
pp. 985-993 ◽  
Author(s):  
C. Bessey ◽  
R. C. Babcock ◽  
D. P. Thomson ◽  
M. D. E. Haywood
Keyword(s):  
Western Australia ◽  
Growth Rates ◽  
Ningaloo Reef
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