scholarly journals Hunting and mountain sheep: Do current harvest practices affect horn growth?

2019 ◽  
Vol 12 (9) ◽  
pp. 1823-1836 ◽  
Author(s):  
Tayler N. LaSharr ◽  
Ryan A. Long ◽  
James R. Heffelfinger ◽  
Vernon C. Bleich ◽  
Paul R. Krausman ◽  
...  
Keyword(s):  
Horn Growth

Horn growth patterns of Nubian ibex from the Sinai, Egypt

Mammalia ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Omar Attum ◽  
Alaaeldin Soultan ◽  
Louis C. Bender
Keyword(s):  
Natural History ◽  
Arid Environment ◽  
Growth Patterns ◽  
Non Invasive ◽  
Significant Relationships ◽  
Horn Growth ◽  
Younger Age ◽  
Invasive Method ◽  
Viable Method ◽  
Horn Development

Abstract Documenting patterns of horn growth and horn-age relationships of Nubian ibex (Capra nubiana) can contribute to a more comprehensive understanding of their natural history, horn development in ibex in general, and future conservation of the species. Our specific objectives included (1) documenting age-horn growth patterns; (2) contrasting horn growth patterns of Nubian ibex with other ibex species; and (3) determining whether horn development accurately reflects age of Nubian ibex in Sinai, Egypt. As expected, all male and female horn measurements had significant relationships with age. Horn growth in males started plateauing at ca. age 7–8, whereas female horn growth started plateauing at ca. age 4–6. The extremely arid environment of Nubian ibex in the Sinai may account for the slowing of horn growth at a younger age than seen in populations of some other ibex species. We found a significant relationship between the number of horn ridges and age, indicating that counting horn ridges provides a viable method of aging males to within ±1 y. Thus counting horn ridges may be a useful and non-invasive method to determine age or age class, which can further our understanding of age structure, the natural history, and management of Nubian ibex populations.

Comparison of Horn Growth in Captive and Free-Ranging Dall's Rams

1997 ◽  
Vol 61 (4) ◽  
pp. 1154 ◽  
Author(s):  
Manfred Hoefs ◽  
Uli Nowlan
Keyword(s):  
Horn Growth ◽  
Free Ranging

Horn Growth and Population Quality in Dall Sheep

1978 ◽  
Vol 42 (4) ◽  
pp. 764 ◽  
Author(s):  
Fred L. Bunnell
Keyword(s):  
Horn Growth ◽  
Population Quality

The role of geological substrate for horn growth in ungulates: a case study on Alpine chamois

2012 ◽  
Vol 27 (1) ◽  
pp. 145-163 ◽  
Author(s):  
Roberta Chirichella ◽  
Simone Ciuti ◽  
Stefano Grignolio ◽  
Michele Rocca ◽  
Marco Apollonio
Keyword(s):  
Horn Growth ◽  
Alpine Chamois ◽  
Geological Substrate

scholarly journals On the effects of complete and incomplete castration upon horn growth in herdwick sheep

1914 ◽  
Vol 48 (2-3) ◽  
pp. 171-176 ◽  
Author(s):  
F. H. A. Marshall ◽  
J. Hammond
Keyword(s):  
Horn Growth

scholarly journals Direct and indirect causal effects of heterozygosity on fitness-related traits in Alpine ibex

2015 ◽  
Vol 282 (1798) ◽  
pp. 20141873 ◽  
Author(s):  
Alice Brambilla ◽  
Iris Biebach ◽  
Bruno Bassano ◽  
Giuseppe Bogliani ◽  
Achaz von Hardenberg
Keyword(s):  
Path Analysis ◽  
Body Mass ◽  
Causal Effects ◽  
Parasite Resistance ◽  
Wild Populations ◽  
Capra Ibex ◽  
Alpine Ibex ◽  
Horn Growth ◽  
Nematode Eggs ◽  
Free Ranging

Heterozygosity–fitness correlations (HFCs) are a useful tool to investigate the effects of inbreeding in wild populations, but are not informative in distinguishing between direct and indirect effects of heterozygosity on fitness-related traits. We tested HFCs in male Alpine ibex ( Capra ibex ) in a free-ranging population (which suffered a severe bottleneck at the end of the eighteenth century) and used confirmatory path analysis to disentangle the causal relationships between heterozygosity and fitness-related traits. We tested HFCs in 149 male individuals born between 1985 and 2009. We found that standardized multi-locus heterozygosity (MLH), calculated from 37 microsatellite loci, was related to body mass and horn growth, which are known to be important fitness-related traits, and to faecal egg counts (FECs) of nematode eggs, a proxy of parasite resistance. Then, using confirmatory path analysis, we were able to show that the effect of MLH on horn growth was not direct but mediated by body mass and FEC. HFCs do not necessarily imply direct genetic effects on fitness-related traits, which instead can be mediated by other traits in complex and unexpected ways.

scholarly journals Mismeasure of secondary sexual traits: an example with horn growth in the Iberian ibex

2012 ◽  
Vol 288 (3) ◽  
pp. 170-176 ◽  
Author(s):  
M. Sarasa ◽  
R. C. Soriguer ◽  
J. -E. Granados ◽  
N. Casajus ◽  
J. M. Pérez
Keyword(s):  
Secondary Sexual Traits ◽  
Iberian Ibex ◽  
Horn Growth ◽  
Sexual Traits ◽  
Secondary Sexual

scholarly journals The effectiveness of clove oil and cautery disbudding methods on preventing horn growth in dairy goat kids

2018 ◽  
Author(s):  
Melissa N Hempstead ◽  
Joseph R. Waas ◽  
Mairi Stewart ◽  
Vanessa M. Cave ◽  
Amanda R. Turner ◽  
...  
Keyword(s):  
Dairy Goat ◽  
Future Research ◽  
Clove Oil ◽  
Horn Growth ◽  
Probability Of Success ◽  
Final Observation ◽  
Bud Growth ◽  
Left And Right ◽  
Oil Injection ◽  
Administration Methods

AbstractThe effectiveness of clove oil and cautery disbudding on horn growth was evaluated in goat kids. The study used 243 Saanen doe kids (4±1.0 days old; mean ± SD) on two commercial dairy goat farms, and were disbudded with either (i) clove oil injection (CLOVE), (ii) a cautery iron and bud removed (BUDOFF), or (iii) a cautery iron with bud left intact (BUDON). Each kid received a different treatment per bud, which were balanced between buds (left and right) and randomly allocated. A trained observer monitored bud growth following treatment for 3 months recording either: N: no growth, H: normal horn, S: abnormal horn (scur), or SC: soft, fibrous lump (scorn). After the final observation, buds were assessed for the probability of detecting (i) success (no growth), (ii) scurs, (iii) horns or (iv) scorns [with 95% CI]. The probability of success for BUDOFF (0.77 [0.63, 0.87]) was higher than for BUDON (0.20 [0.11, 0.34]) and CLOVE (0.09 [0.04, 0.18]; P ≤ 0.05). Furthermore, the probability of success for BUDON was higher than for CLOVE (P ≤ 0.05). The probability of scurs was higher for CLOVE (0.72 [0.63, 0.80]) than BUDOFF (0.25 [0.17, 0.34]) and BUDON (0.30 [0.21, 0.39]; P ≤ 0.05). There was no difference in the probability of scurs for BUDOFF and BUDON (P > 0.05). The probability of horns was higher for CLOVE (0.21 [0.15, 0.29]) than BUDON (0.02 [0.01, 0.06]; P ≤ 0.05); horns were not observed for BUDOFF. The probability of scorns for BUDON, the only treatment that led to scorns, was 0.41 (0.25, 0.60). These results suggest that BUDOFF was more effective at preventing growth than CLOVE and BUDON and appears the most effective method, of the methods tested, for disbudding kids. Future research should explore different clove oil administration methods or other alternatives to cautery disbudding that may be both efficacious and cause less pain.

scholarly journals Comparison of the rate of claw horn growth and wear and sole thickness in dairy cattle housed in a free stall barn with concrete and rubber flooring

2016 ◽  
Author(s):  
Sarel Van Amstel ◽  
Charles Young ◽  
Clare Scully ◽  
Barton Rohrbach
Keyword(s):  
Dairy Cattle ◽  
Milk Production ◽  
Statistical Significance ◽  
Control Group ◽  
Horn Growth ◽  
Significant Difference ◽  
Group 2 ◽  
Concrete Control ◽  
Experimental Group ◽  
Group 1

Background. Thin soles and resulting lameness in cows are often due to abrasive walking surfaces that cause increased wear. The aim of this project was to compare horn growth and wear and sole thickness in cows kept on rubber mats versus concrete in a free-stall barn. Methods. To examine horn growth and wear and sole thickness, we examined two groups (Group 1 kept on concrete [control] and Group 2 on rubber mats) of 12 cows each at 2-week intervals over a 12-week period. The 12 cows in each group were selected to achieve equal parity in each group, as follows: four cows, parity 1; four cows, parity 2; two cows, parity 3; and two cows, parity 4. The four cows from the parity 1 group had the most days in milk in the herd irrespective of milk production. The remaining eight cows had the fewest days in milk (most recently calved) irrespective of milk production. Results. Cows in the control group had a significant increase in claw horn growth over the study period, compared to the control group. Most of this difference in horn growth occurred during the first 2 weeks of the study. There was no significant difference in claw horn wear and sole thickness at 2 weeks or at the end of the study. There was, however, a non-significant difference in wear between cows in the 2 groups at the end of the study, with cows in the control group showing most wear. Cows in the experimental group exhibited significant increases in all parameters (claw length, wear, and growth; sole thickness) when measured at the beginning and end of the trial, whereas cows in the control group showed a significant increase in claw length and sole thickness.Discussion. These findings suggest that there was a compensatory increase in horn production in response to accelerated claw horn wear in the control group. Statistical significance in wear might have been attained between groups at the end of the study if the study had continued over a longer period.

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