Vpliv telesnih lastnosti na dovzetnost za vročinski stres pri kravah mesne pasme mashona v polsušnih pašnih pogojih

Alphonce MATOPE, Titus Jairus ZINDOVE, Marshall DHLIWAYO, Michael CHIMONYO, Musavenga TIVAPASI

Povzetek


Visoke temperature in pogosti vročinski valovi povečujejo nevarnost vročinskega stresa pri govedu na paši, zlasti v sušnih in polsušnih okoljih. Raziskava je analizirala povezave med telesnimi lastnostmi goveda pasme mashona in fiziološkimi parametri, povezanimi z vročinskim stresom. Skupno 200 meritev, pridobljenih na petdesetih kravah, je bilo uporabljenih za preučevanje povezave med sedmimi telesnimi lastnostmi in različnimi fiziološkimi parametri, povezanimi z vročinskim stresom. Telesne lastnosti so bile razvrščene v tri kategorije, ki se nanašajo na obseg telesa (globina telesa, obseg trebuha, prsni obseg), velikost okvira (višina križa in dolžina telesa) in viseči kožni gubi (višina popka in velikost podgrline). S povečevanjem velikosti prsne in trebušne votline se je zmanjševala frekvenca dihanja, srčni utrip in rektalna temperatura, koncentracija trijodtironina v krvi pa se je povečevala. Govedo z večjo globino telesa, in večjim obsegom trebuha ter prsnega koša je imelo nižji srčni utrip, frekvenco dihanja in rektalno temperaturo, vendar višjo koncentracijo trijodotironina v krvi kot govedo s plitvejšim telesom, in manjšim obsegom trebuha ter prsnega koša. S povečevanjem velikosti okvira se je povečevala frekvenca dihanja. Živali z velikim okvirom so imele znatno manjšo frekvenco dihanja in nižjo koncentracijo tiroksina v krvi. Živali manjšega okvira z večjim prsnim obsegom, večjo podgrlino in popkom, bolj oddaljenim od površine tal, so bolje prilagojene na višje temperature okolja.

Ključne besede


govedo; mesne pasme; mashona; paša; vročinski stres; fiziološki parametri; telesne lastnosti; okvir; sušno okolje; polsušno okolj

Celotno besedilo:

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DOI: http://dx.doi.org/10.14720/aas.2023.119.1.2259

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Avtorske pravice (c) 2023 Alphonce MATOPE, Titus Jairus ZINDOVE, Marshall DHLIWAYO, Michael CHIMONYO, Musavenga TIVAPASI

 

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