TY  - JOUR
AU  - Maksimović, Nevena
AU  - Hristov, Slavča
AU  - Milovanović, Aleksandar
AU  - Barna, Tomislav
AU  - Stojanov, Igor
AU  - Cekić, Bogdan
AU  - Milošević-Stanković, Ivana
PY  - 2021
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6233
AB  - The drive to mate females is variable among the rams and can have a major impact on sheep production. Androgen testosterone may be a key mediator within the expression of various morphological and behavioural traits in mammals, but the factors un-derlying individual variation in circulating testosterone levels are poorly understood. The aim of this study was to investigate the development of sexual behaviour patterns in ram lambs as well as the role of testosterone in the expression of their libido. Research was carried out on the sheep farm of the Institute for Animal Husbandry, Belgrade, Serbia. The study included 20 crossbred ram lambs (autochthonous breed Pirot Pramenka x Merinolandschaf x Ile de France). All ram lambs used in the study were of same age and rearing conditions. They were weaned at 2 months of age and kept indoors from birth throughout the whole study. Animals were introduced in the study at the age of 3 months and the trial was completed at the rams’ age of 17 months. Blood samples for testosterone levels were taken bimonthly (at the age of 3, 5, 7, 9, 11, 13, 15 and 17 months), as well as were male-female and male-male interactions recorded. Male-female interactions included the following elements of behaviour: nosing (or anogenital sniffing), pawing, flehmen response, attempted mounts. Also, duration of all male activities directed towards ewe was recorded (male-female interactions in total). Male-male interactions involved the frequency of male-male mounts. Performed investigations showed that sexual behaviour of rams was age dependent, but poorly correlated to serum testosterone. The average serum testosterone levels ranged from 1.83-13.28 ng/mL, and were age dependant (P<0.05). Male-female oriented behaviour developed linearly with age, while male-male specific behaviour was characterized by high intensity in young age and then pronounced variability in later test periods. None of the studied behavioural interactions were high-ly correlated to serum testosterone. These findings support standpoint of more than one factor influencing development of sexual behaviour of ram lambs. © 2021, Massimo Morgante. All rights reserved.
T2  - Large Animal Review
T2  - Large Animal Review
T1  - Development of sexual behaviour in ram lambs and its correlation to serum testosterone
EP  - 34
IS  - 1
SP  - 31
VL  - 27
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_6233
ER  - 

@article{
author = "Maksimović, Nevena and Hristov, Slavča and Milovanović, Aleksandar and Barna, Tomislav and Stojanov, Igor and Cekić, Bogdan and Milošević-Stanković, Ivana",
year = "2021",
abstract = "The drive to mate females is variable among the rams and can have a major impact on sheep production. Androgen testosterone may be a key mediator within the expression of various morphological and behavioural traits in mammals, but the factors un-derlying individual variation in circulating testosterone levels are poorly understood. The aim of this study was to investigate the development of sexual behaviour patterns in ram lambs as well as the role of testosterone in the expression of their libido. Research was carried out on the sheep farm of the Institute for Animal Husbandry, Belgrade, Serbia. The study included 20 crossbred ram lambs (autochthonous breed Pirot Pramenka x Merinolandschaf x Ile de France). All ram lambs used in the study were of same age and rearing conditions. They were weaned at 2 months of age and kept indoors from birth throughout the whole study. Animals were introduced in the study at the age of 3 months and the trial was completed at the rams’ age of 17 months. Blood samples for testosterone levels were taken bimonthly (at the age of 3, 5, 7, 9, 11, 13, 15 and 17 months), as well as were male-female and male-male interactions recorded. Male-female interactions included the following elements of behaviour: nosing (or anogenital sniffing), pawing, flehmen response, attempted mounts. Also, duration of all male activities directed towards ewe was recorded (male-female interactions in total). Male-male interactions involved the frequency of male-male mounts. Performed investigations showed that sexual behaviour of rams was age dependent, but poorly correlated to serum testosterone. The average serum testosterone levels ranged from 1.83-13.28 ng/mL, and were age dependant (P<0.05). Male-female oriented behaviour developed linearly with age, while male-male specific behaviour was characterized by high intensity in young age and then pronounced variability in later test periods. None of the studied behavioural interactions were high-ly correlated to serum testosterone. These findings support standpoint of more than one factor influencing development of sexual behaviour of ram lambs. © 2021, Massimo Morgante. All rights reserved.",
journal = "Large Animal Review, Large Animal Review",
title = "Development of sexual behaviour in ram lambs and its correlation to serum testosterone",
pages = "34-31",
number = "1",
volume = "27",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_6233"
}

Maksimović, N., Hristov, S., Milovanović, A., Barna, T., Stojanov, I., Cekić, B.,& Milošević-Stanković, I.. (2021). Development of sexual behaviour in ram lambs and its correlation to serum testosterone. in Large Animal Review, 27(1), 31-34.
https://hdl.handle.net/21.15107/rcub_agrospace_6233

Maksimović N, Hristov S, Milovanović A, Barna T, Stojanov I, Cekić B, Milošević-Stanković I. Development of sexual behaviour in ram lambs and its correlation to serum testosterone. in Large Animal Review. 2021;27(1):31-34.
https://hdl.handle.net/21.15107/rcub_agrospace_6233 .

Maksimović, Nevena, Hristov, Slavča, Milovanović, Aleksandar, Barna, Tomislav, Stojanov, Igor, Cekić, Bogdan, Milošević-Stanković, Ivana, "Development of sexual behaviour in ram lambs and its correlation to serum testosterone" in Large Animal Review, 27, no. 1 (2021):31-34,
https://hdl.handle.net/21.15107/rcub_agrospace_6233 .

TY  - CONF
AU  - Stanković, B
AU  - Zlatanović, Z
AU  - Hristov, Slavča
AU  - Maksimović, N
AU  - Božić, A
PY  - 2014
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5534
AB  - In this paper reproductive results of six dairy cows farms with total of 766 (farm 1 – 107; farm 2 –175; farm 3 – 49; farm 4 – 400; farm 5 –20 and farm 6 – 11 milking cows) with different system of rearing and welfare level were analyzed. A dairy cow reproductive efficiency is a key factor for milk production - impaired reproductive performance is a major cause of reduced production in dairy industry. 
Welfare and reproductive disorders data were collected by questionnaire regarding criteria of Animal Need Index (ANI – Bartussek et al., 2000) and compared by multidimensional criteria of total discriminating effect. Possibility of movement, lighting and air quality in the accommodation facility, type and quality of floor, possibility of social contacts with other cows and interaction of stockman with cattle were compared and analysed in respect of farm welfare. In respect to the welfare level of lowest ranked farm (farm 6), farms 1, 2, 3, 4, 5 and 6 were ranked as 4th, 2nd, 1st, 5th, 3rd, and 6th, respectively, but in respect to the reproductive and related disorders occurrence rate lowest ranked farm (farm 4), farms 1, 2, 3, 4, 5 and 6 were ranked as 1st, 4th, 2nd, 6th, 5th and 3rd. Discrepancy derives from the fact that reproduction data were collected for a year, while welfare assessment describes reached level in on particular moment of time, not covering all potential causes of reproductive disorders. 
Reduced reproductive success would seem promising as information about poor farm welfare, although good results often are not related to good welfare. Nevertheless, assessed welfare protection level provides important information about herd health and potential reproduction problems, pointing out that there are many opportunities for improving the quality of the welfare of dairy cows, mostly through improving the housing conditions of dairy cows.
C3  - International Symposium on Animal Science 2014, 23-25th September 2014, Belgrade, Serbia
T1  - Reproductive and Related Disorders on Dairy Farms with Different Levels of Welfare Quality
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_5534
ER  - 

@conference{
author = "Stanković, B and Zlatanović, Z and Hristov, Slavča and Maksimović, N and Božić, A",
year = "2014",
abstract = "In this paper reproductive results of six dairy cows farms with total of 766 (farm 1 – 107; farm 2 –175; farm 3 – 49; farm 4 – 400; farm 5 –20 and farm 6 – 11 milking cows) with different system of rearing and welfare level were analyzed. A dairy cow reproductive efficiency is a key factor for milk production - impaired reproductive performance is a major cause of reduced production in dairy industry. 
Welfare and reproductive disorders data were collected by questionnaire regarding criteria of Animal Need Index (ANI – Bartussek et al., 2000) and compared by multidimensional criteria of total discriminating effect. Possibility of movement, lighting and air quality in the accommodation facility, type and quality of floor, possibility of social contacts with other cows and interaction of stockman with cattle were compared and analysed in respect of farm welfare. In respect to the welfare level of lowest ranked farm (farm 6), farms 1, 2, 3, 4, 5 and 6 were ranked as 4th, 2nd, 1st, 5th, 3rd, and 6th, respectively, but in respect to the reproductive and related disorders occurrence rate lowest ranked farm (farm 4), farms 1, 2, 3, 4, 5 and 6 were ranked as 1st, 4th, 2nd, 6th, 5th and 3rd. Discrepancy derives from the fact that reproduction data were collected for a year, while welfare assessment describes reached level in on particular moment of time, not covering all potential causes of reproductive disorders. 
Reduced reproductive success would seem promising as information about poor farm welfare, although good results often are not related to good welfare. Nevertheless, assessed welfare protection level provides important information about herd health and potential reproduction problems, pointing out that there are many opportunities for improving the quality of the welfare of dairy cows, mostly through improving the housing conditions of dairy cows.",
journal = "International Symposium on Animal Science 2014, 23-25th September 2014, Belgrade, Serbia",
title = "Reproductive and Related Disorders on Dairy Farms with Different Levels of Welfare Quality",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_5534"
}

Stanković, B., Zlatanović, Z., Hristov, S., Maksimović, N.,& Božić, A.. (2014). Reproductive and Related Disorders on Dairy Farms with Different Levels of Welfare Quality. in International Symposium on Animal Science 2014, 23-25th September 2014, Belgrade, Serbia.
https://hdl.handle.net/21.15107/rcub_agrospace_5534

Stanković B, Zlatanović Z, Hristov S, Maksimović N, Božić A. Reproductive and Related Disorders on Dairy Farms with Different Levels of Welfare Quality. in International Symposium on Animal Science 2014, 23-25th September 2014, Belgrade, Serbia. 2014;.
https://hdl.handle.net/21.15107/rcub_agrospace_5534 .

Stanković, B, Zlatanović, Z, Hristov, Slavča, Maksimović, N, Božić, A, "Reproductive and Related Disorders on Dairy Farms with Different Levels of Welfare Quality" in International Symposium on Animal Science 2014, 23-25th September 2014, Belgrade, Serbia (2014),
https://hdl.handle.net/21.15107/rcub_agrospace_5534 .