Animal Factors Condition Milk Performance and Quality of Grazing Dairy Cows
محورهای موضوعی : Camel
1 - Centro de Investigaciones Agrarias de Mabegondo, INGACAL, Apdo, 10-15080, La Coruna, Spain
کلید واژه: body condition score, body weight, energy balance, milk quality, potential milk yield, rumen function,
چکیده مقاله :
The base of this review is to consider the relevant role that animal factors (potential milk yield, body weight, body condition score, state of lactation, parity and fertility) play on milk performance (considering the energy balance and the rumen function across the full lactation curve of animals) and milk quality (milk protein content, milk fat content, milk lactose content, vitamins, minerals, immunoglobulins, cells in milk, pathogenic bacteria and inhibitors) of grazing dairy cows (taking into account the substitution rate and the milk response at pasture of animals under different supplementation regimes). All this, looking for high individual milk production and paying attention to grassland management as the key point for sustainability of grazing dairy systems in order to maintain high pasture dry matter intake in the swards with high grass quality (high pasture levels of crude protein, water soluble carbohydrates and digestibility of organic matter but low pasture levels of acid and neutral detergent fibers) all over the grazing season to satisfy cow needs at all times thought the lactation curve of dairy cows. It is also necessary to consider the use of supplementation at pasture (normally at the peak of lactation, when cows are generally in a state of negative energy balance and the provision of silage / concentrate can help to alleviate this situation) to keep the animals within the desired levels of milk production. It seeks, thereby, to achieve an efficient conversion of grass into milk, in a competitive and profitable way taking into consideration the current context in which pasture-based milk production systems are developed in mostly of temperate regions worldwide and focusing our interest in the milk premium price got by dairy farmers in a humid area as Galicia (NW Spain)when we consider the quantity and the quality of the milk delivered to the dairy industry.
مبنا و اساس این مطالعه مروری در نظر گرفتن نقشی است که عوامل حیوانی (تولید شیر بالقوه، وزن بدن، امتیاز شرایط بدنی، وضعیت شیردهی، شکم زایش و باروری) در عملکرد تولید شیر (با در نظر گرفتن توازن انرژی و عملکرد شکمبه در طی منحنی کامل شیردهی حیوانات) و کیفیت شیر (محتوای پروتئین شیر، محتوای چربی شیر، محتوای لاکتوز شیر، ویتامینها، مواد معدنی، ایمنوگلوبولینها، سلولهای شیر، باکتریهای بیماریزا و بازدارندهها) گاوهای شیری در حال چرا ایفا میکنند. البته نرخ جایگزینی و پاسخ تولید شیر در مرتع حیوانات در شرایط مصرف برنامههای مکملسازی مختلف باید در نظر گرفته شود. تمامی این عوامل، در جهت دستیابی به تولید شیر بالا در حیوانات، به مدیریت مرتع به عنوان عامل کلیدی بقای سیستمهای شیری چرا توجه دارند. همچنین مدیریت مرتع به منظور حفظ مصرف ماده خشک مرتعی بالا در چمنزارهای با کیفیت علوفه گرامینه بالا (دارای سطوح بالای پروتئین خام، کربوهیدراتهای محلول در آب و قابلیت هضم ماده آلی در مرتع ولی دارای سطوح پایین الیاف نامحلول در محلول پاک کننده اسیدی و خنثی) حائز اهمیت است. این نوع چمنزارها در تمامی طول فصل چرا نیازهای گاو را در تمامی زمانها و در طی طول دوره شیردهی برآورده مینمایند. همچنین ضروری است تا استفاده از مکملسازی مرتع بتواند سطح تولید شیر را در حد مطلوب حفظ نماید. به طور طبیعی در نقطه اوج دوره شیردهی یعنی زمانی که گاوها به طور کلی در وضعیت توازن منفی انرژی هستند فراهم نمودن مواد سیلو شده یا کنسانتره میتواند به بهبود این شرایط کمک کند. به موجب این امر، باید به دنبال دستیابی به نرخ تبدیل بهینه علوفه گرامینه به شیر به صورت رقابتی و سودآور بود. برای نیل به این هدف سیستمهای تولید شیر مبتنی بر مرتع در بیشتر مناطق معتدله در سرتاسر جهان ایجاد شده است که تأکید آنها بر افزایش قیمت شیر و افزایش درآمد دامداران در نواحی مرطوبی نظیر گالیسیا (در شمال غربی اسپانیا) است. در این صورت بهبود کمیت و کیفیت شیر تولیدی به صنایع شیری انتقال مییابد.
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