TY  - JOUR
AU  - Nikšić, Dragan
AU  - Mićić, Nenad
AU  - Ostojić-Andrić, Dušica
AU  - Perišić, Predrag
AU  - Lazarević, Marina
AU  - Petričević, Veselin
AU  - Samolovac, Ljiljana
PY  - 2023-12
UR  - http://r.istocar.bg.ac.rs/handle/123456789/974
AB  - Milk fat content stands out as a crucial production trait in cows, and this study delves into its variability based on various factors. The
research investigated how the housing method (large farm or individual producers), origin (domestic-rearing or imported cows), and
calving season collectively impact this trait. Cows reared on the farm exhibited a higher milk fat content compared to those raised by
individual producers. Additionally, primiparous cows from domestic rearing displayed lower milk fat content than their counterparts
of imported origin. Among primiparous cows on the farm, those calving in the summer and autumn produced the highest milk fat
content. Conversely, primiparous cows calving in the spring season and raised by individual producers recorded the lowest milk fat
content. The statistical analysis revealed a highly significant influence of calving season, with a noteworthy interaction among housing
method and origin on the observed trait. The significance ranged from statistically highly significant (P ≤ 0.01) to statistically very
highly significant (P ≤ 0.001).
PB  - Faculty of Agronomy Čačak
T2  - Acta Agriculturae Serbica
T1  - Factors affecting milk fat variability in primiparous Simmental cows: housing methods, origin, and calving season
VL  - 28
IS  - 56
SP  - 131
EP  - 135
DO  - 10.5937/AASer2356131N
ER  - 

@article{
author = "Nikšić, Dragan and Mićić, Nenad and Ostojić-Andrić, Dušica and Perišić, Predrag and Lazarević, Marina and Petričević, Veselin and Samolovac, Ljiljana",
year = "2023-12",
abstract = "Milk fat content stands out as a crucial production trait in cows, and this study delves into its variability based on various factors. The
research investigated how the housing method (large farm or individual producers), origin (domestic-rearing or imported cows), and
calving season collectively impact this trait. Cows reared on the farm exhibited a higher milk fat content compared to those raised by
individual producers. Additionally, primiparous cows from domestic rearing displayed lower milk fat content than their counterparts
of imported origin. Among primiparous cows on the farm, those calving in the summer and autumn produced the highest milk fat
content. Conversely, primiparous cows calving in the spring season and raised by individual producers recorded the lowest milk fat
content. The statistical analysis revealed a highly significant influence of calving season, with a noteworthy interaction among housing
method and origin on the observed trait. The significance ranged from statistically highly significant (P ≤ 0.01) to statistically very
highly significant (P ≤ 0.001).",
publisher = "Faculty of Agronomy Čačak",
journal = "Acta Agriculturae Serbica",
title = "Factors affecting milk fat variability in primiparous Simmental cows: housing methods, origin, and calving season",
volume = "28",
number = "56",
pages = "131-135",
doi = "10.5937/AASer2356131N"
}

Nikšić, D., Mićić, N., Ostojić-Andrić, D., Perišić, P., Lazarević, M., Petričević, V.,& Samolovac, L.. (2023-12). Factors affecting milk fat variability in primiparous Simmental cows: housing methods, origin, and calving season. in Acta Agriculturae Serbica
Faculty of Agronomy Čačak., 28(56), 131-135.
https://doi.org/10.5937/AASer2356131N

Nikšić D, Mićić N, Ostojić-Andrić D, Perišić P, Lazarević M, Petričević V, Samolovac L. Factors affecting milk fat variability in primiparous Simmental cows: housing methods, origin, and calving season. in Acta Agriculturae Serbica. 2023;28(56):131-135.
doi:10.5937/AASer2356131N .

Nikšić, Dragan, Mićić, Nenad, Ostojić-Andrić, Dušica, Perišić, Predrag, Lazarević, Marina, Petričević, Veselin, Samolovac, Ljiljana, "Factors affecting milk fat variability in primiparous Simmental cows: housing methods, origin, and calving season" in Acta Agriculturae Serbica, 28, no. 56 (2023-12):131-135,
https://doi.org/10.5937/AASer2356131N . .

TY  - CONF
AU  - Mićić, Nenad
AU  - Stanojević, Dragan
AU  - Samolovac, Ljiljana
AU  - Nikšić, Dragan
AU  - Lazarević, Marina
AU  - Gantner, Vesna
AU  - Bogdanović, Vladan
PY  - 2023-10
UR  - http://r.istocar.bg.ac.rs/handle/123456789/926
AB  - The term heat stress in mammals implies the sum of environmental influences that cause an increase in the body temperature of the organism. In dairy cow breeds, heat stress primarily reduces milk yield and milk quality, and then impairs fertility, welfare and causes changes in behaviour. This has especially come into the focus in recent years with the increasingly pronounced consequences of climate change. The aim of the research was to determine the effects of various fixed factors on milk yield performance traits of cows: MY – daily milk yield (kg/day), MF - milk fat content (%) and MP - milk protein content (%). The total data set contained test-day information for the analyzed traits during the summer period, and the effects of breed, breeding location, order and stage of lactation, year and season of calving, as well as the month of control were investigated. From the total set, selected data were used that correspond to the values of the daily temperature-humidity index of at least 72 (THI≥72), as an indicator of the occurrence of heat stress. Manifestation and variability of the studied traits, as well as the influence of individual factors on the studied traits, was determined using appropriate procedures within the SAS statistical program. High
statistical significance of all factors included in the model was established (p<0.001). Cows achieved the highest daily milk yield if they calved during the spring season, in their third lactation and in the interval of the second stage (61-120 days) of lactation. Milk yield decreased during the summer months from June to September. The fat content was the lowest in cows which calved in the spring season, during the first
lactation and the first stage of lactation (<60 days), it was lower during July, August and September compared to the month of June. During the summer, the protein content decreased from June to August,
while it increased in the subsequent stages of lactation. The stressogenic impact of the summer period on
milk production in cows is present every year to a greater or lesser extent, depending on a combination of several factors. Research confirms that the risk of heat stress, in addition to the summer period, is often
present from April until October.
PB  - Institut za stočarstvo, Beograd-Zemun
C3  - 14th International symposium „Modern trends in livestock production“, Book of abstracts
T1  - Dairy cattle milk production during summer under heat stress conditions
SP  - 14
EP  - 14
UR  - https://hdl.handle.net/21.15107/rcub_ristocar_926
ER  - 

@conference{
author = "Mićić, Nenad and Stanojević, Dragan and Samolovac, Ljiljana and Nikšić, Dragan and Lazarević, Marina and Gantner, Vesna and Bogdanović, Vladan",
year = "2023-10",
abstract = "The term heat stress in mammals implies the sum of environmental influences that cause an increase in the body temperature of the organism. In dairy cow breeds, heat stress primarily reduces milk yield and milk quality, and then impairs fertility, welfare and causes changes in behaviour. This has especially come into the focus in recent years with the increasingly pronounced consequences of climate change. The aim of the research was to determine the effects of various fixed factors on milk yield performance traits of cows: MY – daily milk yield (kg/day), MF - milk fat content (%) and MP - milk protein content (%). The total data set contained test-day information for the analyzed traits during the summer period, and the effects of breed, breeding location, order and stage of lactation, year and season of calving, as well as the month of control were investigated. From the total set, selected data were used that correspond to the values of the daily temperature-humidity index of at least 72 (THI≥72), as an indicator of the occurrence of heat stress. Manifestation and variability of the studied traits, as well as the influence of individual factors on the studied traits, was determined using appropriate procedures within the SAS statistical program. High
statistical significance of all factors included in the model was established (p<0.001). Cows achieved the highest daily milk yield if they calved during the spring season, in their third lactation and in the interval of the second stage (61-120 days) of lactation. Milk yield decreased during the summer months from June to September. The fat content was the lowest in cows which calved in the spring season, during the first
lactation and the first stage of lactation (<60 days), it was lower during July, August and September compared to the month of June. During the summer, the protein content decreased from June to August,
while it increased in the subsequent stages of lactation. The stressogenic impact of the summer period on
milk production in cows is present every year to a greater or lesser extent, depending on a combination of several factors. Research confirms that the risk of heat stress, in addition to the summer period, is often
present from April until October.",
publisher = "Institut za stočarstvo, Beograd-Zemun",
journal = "14th International symposium „Modern trends in livestock production“, Book of abstracts",
title = "Dairy cattle milk production during summer under heat stress conditions",
pages = "14-14",
url = "https://hdl.handle.net/21.15107/rcub_ristocar_926"
}

Mićić, N., Stanojević, D., Samolovac, L., Nikšić, D., Lazarević, M., Gantner, V.,& Bogdanović, V.. (2023-10). Dairy cattle milk production during summer under heat stress conditions. in 14th International symposium „Modern trends in livestock production“, Book of abstracts
Institut za stočarstvo, Beograd-Zemun., 14-14.
https://hdl.handle.net/21.15107/rcub_ristocar_926

Mićić N, Stanojević D, Samolovac L, Nikšić D, Lazarević M, Gantner V, Bogdanović V. Dairy cattle milk production during summer under heat stress conditions. in 14th International symposium „Modern trends in livestock production“, Book of abstracts. 2023;:14-14.
https://hdl.handle.net/21.15107/rcub_ristocar_926 .

Mićić, Nenad, Stanojević, Dragan, Samolovac, Ljiljana, Nikšić, Dragan, Lazarević, Marina, Gantner, Vesna, Bogdanović, Vladan, "Dairy cattle milk production during summer under heat stress conditions" in 14th International symposium „Modern trends in livestock production“, Book of abstracts (2023-10):14-14,
https://hdl.handle.net/21.15107/rcub_ristocar_926 .