Streszczenie. Praca miała na celu ocenę wpływu kondycji samców norki hodowlanej (Neovison vison) w okresie kopulacyjnym na ich zachowanie oraz wyniki kojarzeń. Do badań wybrano 170 samców, odmiany perła. Przed okresem kryć podzielono samce na 3 grupy doświadczalne w zależności od ich kondycji: grupa I-norki bardzo chude, grupa II-norki chude i idealne pod względem kondycji, grupa III-norki o wyglądzie ciężkim i norki otyłe. Po zakończeniu okresu kryć przeanalizowano dane rozrodcze dotyczące: liczby dni, w których kryły samce, liczby kryć w ciągu dnia i w ciągu całego okresu kojarzeń, procentu samców, które nie kryły oraz procentu występowania zachowań agresywnych. W wyniku statystycznej analizy nie stwierdzono różnic w średniej liczbie dni kojarzeń, liczbie kryć w ciągu całego okresu ani w liczbie kryć w ciągu dnia. Kondycja samców miała istotny wpływ na zachowanie się zwierząt w okresie kojarzeń. Najwięcej zachowań agresywnych (około 16%) wystąpiło u zwierząt z grup I i II, a więc u zwierząt o kondycji od bardzo chudej do idealnej; o połowę mniej takich zachowań zanotowano w grupie zwierząt otyłych (III)-ok. 8%. Zupełnie inną zależność pokazało wygryzanie okrywy włosowej, ponieważ żaden samiec z grupy chudych i idealnych (II) nie wygryzał okrywy. Tylko samce bardzo chude z grupy I (2%) i otyłe z grupy III (4,17%) wygryzały okrywę. W grupie II zanotowano najmniejszy procent samców, które nie kryły (około 6%), natomiast w grupach I i III zanotowano tych samców około 10%.
Abstract. The aim of the study was to analyse the sex ratio of American mink litters in relation to dam's age, gestation length, and time interval between the first and second mating. The observations were carried out on a mink farm located in northern Poland. The analysis involved litters of 207 females, aged 1 (n=107) and 2 years (n=100), which successfully raised all the born kits. The sex of the offspring was identified on weaning. The kits were assigned to groups according to their dam's gestation length, mating date, and first-to-second mating interval. It was found that female kits quantitatively predominated over male offspring. Longer pregnancies, delayed mating time, and greater interval between the first and second mating was accompanied by a higher number of female births in relation to male births.
The aim of the study was to analyze various mating systems, mating dates, and the number of matings applied for farmed American mink in relation to resulting litter sizes. The observations were carried out on yearling females of two color varieties, Perl (P) and White Hedlund (WH), as well as yearling males belonging to four color varieties, namely P, WH, White Regal (WR) and Black Cross (BC). The color of the males was chosen so as to easily discern, which male sired which litter and what was the litter size resulting from the particular copulation date. The breeders were mated according to various mating schemes. The analysis revealed that if two matings were the case, most embryos conceived on the first date died.
The study focused on an analysis of body weight, fur quality and selected blood biochemical indices in farm mink fed a diet with an addition of probiotics containing effective microorganisms. The feeding trial was conducted in 2013 on a population of Silverblue mink. The experimental group was offered the probiotics supplement with their daily ration. The control group did not receive a probiotic supplement. Body weight gains, blood AST and ALT content and the quality of fur were analyzed. The probiotic supplement positively and statistically significantly influenced the body weight gains of the mink, particularly in males. The supplement had a beneficial effect also in terms of pelt quality, since the animals fed the probiotic yielded pelts in the highest class of quality.
The aim of this study was to compare the rearing of mink in nests insulated with different materials. The study was conducted on a large-scale mink farm located in northwestern Poland. The results of rearing mink from 144 females of the pearl variety, aged one and two years, were analyzed. Four groups were created, taking into account the type of nest lining material and the age of the females. Two weeks prior to the scheduled birth, the nesting houses were lined with two types of insulating material - sawdust from deciduous trees and a mixture of barley straw and hay from meadow vegetation. Data were collected on: the number of born and live-born cubs per litter, the number of reared mink per litter, and the mortality of mink during the rearing period at the mothers. It was found that the material with which mink nests are insulated has an effect on the number of born, live-born and weaned mink. Better reproductive results were reported for females whose nests were insulated with barley straw mixed with meadow hay. They gave birth to larger litters, with more live mink, and raised more young. The mortality rate of young mink was lower in nests insulated with a mixture of straw and hay. The results showed that the use of sawdust as a nest insulating material is associated with a lower survival rate of reared mink. The study shows that the choice of a suitable nest insulating material can favorably affect the number of reared young mink.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.