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Effect of turkeys genotype on results on their slaughter performance

100%

Damaziak K., Michalczuk M., Siennicka A.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2012

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tom 51

Two groups of turkeys: slow-growing primitive turkeys (SS n = 80 and n = 80) and fast-growing Big-6 turkeys (<$<$ n = 80 and n = 80) were reared in a semi-intensive system: turkey hens until 14th week whereas turkey toms until 22nd week of life. Twelve males and twelve females with body weight corresponding to the mean body weight in a group were selected from each group for slaughter and slaughter performance analysis. A significantly (P < 0.01) higher body weight and weight of all anatomical parts examined were found in both hens and males of Big-6 turkeys. An exception was the weight of abdominal fat (P < 0.05) and weight of gizzard (NS) in males. In turn, Big--6 females were characterized by a significantly (P < 0.01) higher percentage of: breast muscles (by 8.7), leg muscles (by 2.4) and abdominal fat (by 0.9), and significantly (P < 0.01) lower percentage of: wings, heart, liver and gizzard (by respectively: 0.2, 0.1, 0.3 and 1.9) in the body weight. In the case of Big-6 males, analyses demonstrated a significantly (P < 0.01) higher percentage of breast muscles (by 16.5) and leg muscles (by 2.5, P < 0.05), and lower (P < 0.01) percentage of wing, heart, liver and gizzard (by respectively: 0.3, 0.2, 0.7 and 1.5) in the body weight, compared to the primitive turkeys.

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Wpływ selekcji i doboru na płodność i plenność owcy pomorskiej

80%

Kawecki A., Kmiec M.

Zeszyty Problemowe Postępów Nauk Rolniczych

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1988

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tom 352

Соответствующие исследования проводились в период 1979-1984 гг. в двух стадах овец поморской разновидности, со средней численностью основного стада: I - 990 овцематок и II - 562 овцематок. В стаде I проводилась дополнительно селекция с точки зрения ягнят происходящих из близнецевых окотов. Определяли: 1) показатели оплотворимости плодовитости и выращивания ягнят, 2) зависимость между типом первого окота и жизненной репродуктивной способностью овцематок, 3) влияние на оплодотворимость подбора пар - матерей и отцов - происходящих из единичных и близнецевых окотов. Установлено, что самая высокая жизненная оплодотворимость достигается овцематками из близнецевых окотов (I - 159,8, II - 153,6%). Высокой оплотворимостью отличаются пары, в которых по крайней мере одна особь происходит из близнецевых окотов, при незначительном превосходстве случек ♀ P х ♂ B. Селекция и подбор с точки зрения происхождения из близнецевых окотов существенно повышали оплодотворимость в стаде.

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Effects of selection for more vigorous seminal roots in two cross populations of oat [Avena sativa L.]

80%

Gorny A. G., Szolkowska A.

Journal of Applied Genetics

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1996

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tom 37

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nr 4

Three steps of multi-stage selection for more vigorous seminal roots were done in two cross combinations of oat. The total length of roots (TRL) was measured in seedlings of the F₂, F₃ and F₄ generations grown in filter-paper rollers. On average, the finally selected F₅ (or F₆) progenies distinguished by 7-11% improved rooting ability than their midparents. Transgressive forms were selected only in one cross combination. Coefficients of realized heritability for TRL were low and ranged from 0.08 to 0.42 indicatinga relatively high proportion of non-additive gene effects in the variance of TRL. Tolerance of the F₆-progenies to water and nutrient limitations was evaluated in pot and field experiments. Correlated selection effects were dependent upon initial cross combination. Only progenies from one cross combination exhibited an improved drought tolerance at the 8-9 Feekes' stage. The both enhanced rooting and decreased S : R ratio of the F₆-progenies correlated with their improved tolerance to reduced P supply at the 4-leaf stage. However, no significant consistence occurred between indices of the tolerance to reduced nutrition at the vegetative growth and those at field maturity. Performed root selection identified more frequently high yielding genotypes with less stable grain yield. No progenies were obtained that outperform their parents under low-input conditions. It was emphasized that root selection should be accompanied by selection for integrated response components.

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Animal Science

1 Journal of Applied Genetics

1 Zeszyty Problemowe Postępów Nauk Rolniczych

1 Damaziak K.

1 Gorny A. G.

1 Kawecki A.

1 Kmiec M.

1 Michalczuk M.

1 Siennicka A.

1 Szolkowska A.

1 2012

1 1996

1 1988

Effect of turkeys genotype on results on their slaughter performance

Wpływ selekcji i doboru na płodność i plenność owcy pomorskiej

Effects of selection for more vigorous seminal roots in two cross populations of oat [Avena sativa L.]