Analiza trofejne vrijednosti jelena običnog u odnosu na invadiranost metiljem Fascioloides magna

master's thesis

• Title (english): Analysis of Red Deer Trophy Value with Respect to Fascioloides magna Infection
• Author: Evamaria Klarić
• Mentor: Dean Konjević (mentor)
• Mentor: Krešimir Krapinec (komentor)
• Committee member: Zdravko Janicki (predsjednik povjerenstva)
• Committee member: Krešimir Krapinec (član povjerenstva)
• Committee member: Dean Konjević (član povjerenstva)
• Granter: University of Zagreb; Faculty of Veterinary Medicine; Zagreb
• Defense date and country: 2024-11-26, Croatia
• Scientific / art field, discipline and subdiscipline: BIOMEDICINE AND HEALTHCARE; Veterinary Medicine; Veterinary Public Health and Food Safety

Abstract

Metilj Fascioloides magna izvorno je parazit američkih vrsta jelena koji je u Europu
unesen najmanje dva puta. Dolaskom u nova staništa ovaj metilj je uspostavio i nove asocijacije
nositelj-parazit koje još uvije prolaze proces međusobne prilagodbe. Iako je jelen obični tipični
nositelj ovoga metilja, za očekivati je da će jače invazije imati posljedice na produktivnost. U
mužjaka je upravo rogovlje, kao sekundarna spolna oznaka, jedno od svojstava na kojima se
mogu očekivati posljedice invazije. U ovom istraživanju uspoređene su trofejne vrijednosti i
parametri ocjene trofeja s jačinom invazije metiljem F. magna na 108 jelena običnih
podrijetlom iz državnog otvorenog lovišta ''PODUNAVLJE-PODRAVLJE''. Ocjembeni listovi
dobiveni su od Hrvatskih šuma d.o.o., a podatci o invadiranosti jelena iz Programa suzbijanja
fascioloidoze za navedeno lovište. Testiranje normaliteta raspodjele provedeno je Shapiro-Wilk
testom. Krivulje rasta zavisnih značajki izjednačene su modificiranom Weibullovom
funkcijom, korištenjem Gauss-Newton algoritma. Izračun povezanosti istraživanih značajki
izvršen je Kendall-Tau korelacijskim koeficijentom. Rezultati su pokazali da je duljina grane
statistički znakovito povezana s invazijom metilja i to kod jelena u dobi od šest godina (s brojem
migracija; τ = -0,577), u dobi od sedam godina (s brojem metilja; τ = -0,381) i u dobi od osam
godina (s brojem pseudocista; τ = -0,402). Nadalje, prema rezultatima korelacijske analize,
statistički znakovit negativan utjecaj na ukupan opseg rogovlja imaju ukupan broj migracija i
pseudocista u jelena u dobi od šest godina (τ = - 0,681; respektivno τ = - 0,681). Broj migracija
negativno utječe na masu rogovlja jelena dobi od šest godina (τ = -0,681), dok broj metilja
negativno utječe na masu rogovlja kod jelena u dobi od devet godina (τ = -0,296). Provedenim
istraživanjem potvrđen je utjecaj invazije na produktivnost jelena običnoga. Rezultati su u
skladu sa sličnim istraživanjima na bjelorepom jelenu. Uočena povezanost invazije s trofejnom
vrijednošću u mlađih jelena vjerojatna je posljedica još prisutnih povećanih zahtjeva
neophodnih za rast organizma.

Abstract (english)

Liver fluke Fascioloides magna is originally a parasite of American deer species that
was introduced to Europe at least two times. By arriving in new habitats, this fluke established
new host-parasite associations that are still undergoing a process of mutual adaptation.
Although red deer is the typical host of this fluke, it is to be expected that stronger infections
will have consequences on deer’s productivity. In males, the antlers, as a secondary ornaments,
are one of the characteristics that could be influenced by infection. In this research, the trophy
values and trophy evaluation parameters were compared with the intensity of F. magna
infection in 108 red deer originating from the state open hunting ground "PODUNAVLJEPODRAVLJE". The grading sheets were obtained from Croatian Forests, and the data on
infection from the Fascioloidosis Control Program for the mentioned hunting ground. Testing
for normality of distribution was performed with the Shapiro-Wilk test. The growth curves of
the dependent variables were equalized by a modified Weibull function, using the GaussNewton algorithm. The relationship between the analysed features was calculated using the
Kendall-Tau correlation coefficient. The results showed that beam length is statistically
significantly related to fluke infection in deer at the age of six (with the number of migratory
stages; τ = -0.577), at the age of seven (with the number of flukes; τ = -0.381) and at the age of
eight years (with the number of pseudocysts; τ = -0.402). Furthermore, according to the results
of the correlation analysis, the total number of migratory stages and pseudocysts in deer at the
age of six years has a statistically significant negative impact on the total length of antlers (τ =
- 0.681; respectively τ = - 0.681). The number of migratory stages negatively affects the antler
mass of six-year-old deer (τ = -0.681), while the number of flukes negatively affects the antler
mass of nine-year-old deer (τ = -0.296). The conducted research confirmed the influence of the
infection on the deer’s productivity. The results are consistent with similar research on whitetailed deer. The observed association of infection with trophy value in younger deer is likely a
consequence of the still present increased requirements for organism growth.

• Keywords: jelen obični; Fascioloides magna; trofejna vrijednost; jačina invazije
• Keywords (english): red deer; Fascioloides magna; trophy value; intensity of infection
• Language: croatian
• URN:NBN: urn:nbn:hr:178:879717
• Study programme: Title: Veterinary Medicine; Study programme type: university; Study level: integrated undergraduate and graduate; Academic / professional title: doktor/doktorica veterinarske medicine (doktor/doktorica veterinarske medicine)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-01-14 09:48:24